Microsoft Word - 211015 - Juruena resplits - FINAL
ASX RELEASE 23 Oct 2015
Follow‐up drill sampling confirms high‐grade gold results at Juruena
Highlights
Sampling of individual samples from previously released composite sample results return up to 3m @ 161 g/t gold
(inc. 1m @ 329 g/t gold from 101m in MR‐10/2015 ‐Dona Maria prospect)
The original 4m composite sample results from MR‐10/2015 returned 12m @ 35.13 g/t gold from 99m. Single metre samples from this composite were collected in the field, re‐submitted to the lab and returned;
Individual samples are routinely done on composite samples with results >0.5g/t gold to more precisely define mineralised zones
New results from follow‐up drill core sampling from Dona Maria prospect, increases significant intercept in MD‐01/2015 from 3.4m @ 48 g/t gold (from 183.25m) to 8m @ 21.76 g/t gold from 179m
New results from follow‐up drill core sampling from Querosene prospect includes 1.03m @ 58.2 g/t gold from 88.46m in hole QD‐05/2015
Strong repeatability of composite versus individual samples across all of the prospects drilled in 204/15, is demonstrated and increases confidence in the drilling representivity
Global Resource Engineering commissioned to undertake preliminary economic assessment to assist with consideration of potential trial mining operation
Crusader has received encouraging results from a program of re‐sampling of composite samples that can better define mineralisation zones at the Juruena Gold Project. This sampling is implemented when the previously received composite drill sample results (see ASX announcements released on 18/12/2014, 17/03/2015, 08/05/2015 and 01/07/2015) return values over 0.5 g/t gold.
The Juruena Project (> 400km2 of contiguous tenements, 100% Crusader owned) is located in Central Brazil on the southern fringe of the Amazon basin. Situated on the western end of the prospective Juruena‐Alta Floresta gold belt (estimated to have produced ~7Moz Au), Juruena has been worked extensively by artisanal miners (garimpeiros) since the 1980s, producing an estimated 500koz of gold.
Crusader recently announced (ASX Announcement - 29 September 2015) a maiden resource for three prospects at Juruena, including the Dona Maria, Querosene and Crentes prospects. The maiden resource estimated a total of 1.3Mt @ 5.6g/t for 234koz Au.
ASX RELEASE 23 Oct 2015
Drill sample results -Composite comparison
A full table comparing the composite sample results (previously reported) and the newer individual metre results, as well as a graphical summary of the results, is presented below. The data shows that there is no significant bias between the composite sample results and the individual sample results (re‐composited for comparison).
Composite sampling (when several intervals of drilling are submitted as a single sample) is routinely implemented in RC drilling as a means to reduce assaying costs. The geologist on the drill rig, logs the hole and selects the most prospective sections‐ these are sampled on normal spacing‐ either 0.5m or 1m (depending on the prospect). Areas considered less prospective are composite sampled in order to ensure coverage of the entire hole. Once results are received, composite results above the nominal 0.5 g/t cutoff are re‐submitted in their original sample intervals, either 0.5m or 1m.
New Diamond drill results -holes MD‐01/2015 and QD‐05/2015 (Dona Maria and Querosene prospects)
Crusader has received results from follow‐up sampling of Diamond core which were recently cut, sampled and sent to the lab. The sections of core which were cut and sampled, were targeted after the initial samples results were received and interpreted, prompting follow‐up sampling in several holes. The full results are published in Table 2 below and illustrated in Figure 1. Highlights include;
-
MD‐01/2015 from 3.4m @ 48g/t gold (from 183.25m), has been extended to;
o 8m @ 21.76g/t gold from 179m‐ Dona Maria prospect
-
QD‐05/2015 1.03m @ 58.2 g/t gold from 88.46m - Querosene prospect
Significant intercepts are calculated based on a 1g/t lower cut‐off, no upper cut and up to 2m of consecutive internal dilution.
Preliminary Economic Assessment
Global Resource Engineering (GRE), a Denver based mining engineering firm specialising in providing geology and engineering services to developing and existing projects, has commenced work to assess the economics of a high‐grade trial mining operation at Juruena. This work will involve scoping level underground mine designs for Querosene and Dona Maria. GRE has substantial Brazilian experience and importantly completed work on similar projects also located in the Amazon regions of Brazil.
ASX RELEASE 23 Oct 2015
Figure 1: Cross section through Dona Maria prospect showing holes MR‐10/2015 and MD‐01/2015
ASX RELEASE 23 Oct 2015
Table 1: Juruena drilling results - Composite and individual sample results
Old Composite Sample Results
|
New Individual Sample Results
|
Hole ID
|
From
|
To
|
Interval
|
Au_ppm
|
Hole ID
|
From
|
To
|
Interval
|
Au_ppm
|
CR‐10/2015
|
121.00
|
122.00
|
1.00
|
0.80
|
CR‐10/2015
|
121.00
|
121.50
|
0.50
|
1.799
|
CR‐10/2015
|
121.50
|
122.00
|
0.50
|
0.051
|
CR‐11/2015
|
52.00
|
56.00
|
4.00
|
0.67
|
CR‐11/2015
|
52.00
|
53.00
|
1.00
|
0.714
|
CR‐11/2015
|
53.00
|
54.00
|
1.00
|
0.255
|
CR‐11/2015
|
54.00
|
55.00
|
1.00
|
0.239
|
CR‐11/2015
|
55.00
|
56.00
|
1.00
|
1.399
|
CR‐11/2015
|
60.00
|
61.00
|
1.00
|
0.53
|
CR‐11/2015
|
60.00
|
60.50
|
0.50
|
0.633
|
CR‐11/2015
|
60.50
|
61.00
|
0.50
|
0.580
|
CR‐11/2015
|
61.00
|
62.00
|
1.00
|
0.57
|
CR‐11/2015
|
61.00
|
61.50
|
0.50
|
0.562
|
CR‐11/2015
|
61.50
|
62.00
|
0.50
|
0.698
|
CR‐11/2015
|
68.00
|
69.00
|
1.00
|
0.64
|
CR‐11/2015
|
68.00
|
68.50
|
0.50
|
0.753
|
CR‐11/2015
|
68.50
|
69.00
|
0.50
|
0.757
|
CR‐11/2015
|
79.00
|
80.00
|
1.00
|
2.57
|
CR‐11/2015
|
79.00
|
79.50
|
0.50
|
3.781
|
CR‐11/2015
|
79.50
|
80.00
|
0.50
|
1.005
|
CR‐12/2015
|
42.00
|
43.00
|
1.00
|
0.65
|
CR‐12/2015
|
42.00
|
42.50
|
0.50
|
0.340
|
CR‐12/2015
|
42.50
|
43.00
|
0.50
|
0.565
|
CR‐12/2015
|
55.00
|
59.00
|
4.00
|
0.69
|
CR‐12/2015
|
55.00
|
56.00
|
1.00
|
0.398
|
CR‐12/2015
|
56.00
|
57.00
|
1.00
|
0.488
|
CR‐12/2015
|
57.00
|
58.00
|
1.00
|
0.553
|
CR‐12/2015
|
58.00
|
59.00
|
1.00
|
0.897
|
CR‐12/2015
|
79.00
|
83.00
|
4.00
|
0.51
|
CR‐12/2015
|
79.00
|
80.00
|
1.00
|
0.388
|
CR‐12/2015
|
80.00
|
81.00
|
1.00
|
0.957
|
CR‐12/2015
|
81.00
|
82.00
|
1.00
|
0.121
|
CR‐12/2015
|
82.00
|
83.00
|
1.00
|
0.070
|
CR‐13/2015
|
12.00
|
16.00
|
4.00
|
5.19
|
CR‐13/2015
|
12.00
|
13.00
|
1.00
|
3.886
|
CR‐13/2015
|
13.00
|
14.00
|
1.00
|
9.811
|
CR‐13/2015
|
14.00
|
15.00
|
1.00
|
2.955
|
CR‐13/2015
|
15.00
|
16.00
|
1.00
|
0.582
|
CR‐13/2015
|
44.00
|
48.00
|
4.00
|
1.10
|
CR‐13/2015
|
44.00
|
45.00
|
1.00
|
0.167
|
CR‐13/2015
|
45.00
|
46.00
|
1.00
|
0.242
|
CR‐13/2015
|
46.00
|
47.00
|
1.00
|
0.252
|
CR‐13/2015
|
47.00
|
48.00
|
1.00
|
9.365
|
CR‐13/2015
|
48.00
|
52.00
|
4.00
|
0.94
|
CR‐13/2015
|
48.00
|
49.00
|
1.00
|
0.761
|
CR‐13/2015
|
49.00
|
50.00
|
1.00
|
1.096
|
CR‐13/2015
|
50.00
|
51.00
|
1.00
|
0.675
|
CR‐13/2015
|
51.00
|
52.00
|
1.00
|
0.290
|
CR‐13/2015
|
52.00
|
56.00
|
4.00
|
2.83
|
CR‐13/2015
|
52.00
|
53.00
|
1.00
|
0.616
|
CR‐13/2015
|
53.00
|
54.00
|
1.00
|
8.311
|
CR‐13/2015
|
54.00
|
55.00
|
1.00
|
0.067
|
CR‐13/2015
|
55.00
|
56.00
|
1.00
|
2.796
|
CR‐13/2015
|
56.00
|
60.00
|
4.00
|
0.87
|
CR‐13/2015
|
56.00
|
57.00
|
1.00
|
0.382
|
CR‐13/2015
|
57.00
|
58.00
|
1.00
|
0.394
|
CR‐13/2015
|
58.00
|
59.00
|
1.00
|
0.615
|
CR‐13/2015
|
59.00
|
60.00
|
1.00
|
0.304
|
ASX RELEASE 23 Oct 2015
Table 1: continued
Old Composite Sample Results
|
New Individual Sample Results
|
Hole ID
|
From
|
To
|
Interval
|
Au_ppm
|
Hole ID
|
From
|
To
|
Interval
|
Au_ppm
|
CR‐13/2015
|
61.00
|
62.00
|
1.00
|
0.83
|
CR‐13/2015
|
61.00
|
61.50
|
0.50
|
0.257
|
CR‐13/2015
|
61.50
|
62.00
|
0.50
|
0.771
|
CR‐13/2015
|
62.00
|
63.00
|
1.00
|
0.68
|
CR‐13/2015
|
62.00
|
62.50
|
0.50
|
0.591
|
CR‐13/2015
|
62.50
|
63.00
|
0.50
|
0.443
|
CR‐13/2015
|
63.00
|
64.00
|
1.00
|
0.57
|
CR‐13/2015
|
63.00
|
63.50
|
0.50
|
0.562
|
CR‐13/2015
|
63.50
|
64.00
|
0.50
|
1.511
|
CR‐13/2015
|
64.00
|
65.00
|
1.00
|
1.83
|
CR‐13/2015
|
64.00
|
64.50
|
0.50
|
0.947
|
CR‐13/2015
|
64.50
|
65.00
|
0.50
|
1.064
|
CR‐13/2015
|
65.00
|
66.00
|
1.00
|
1.16
|
CR‐13/2015
|
65.00
|
65.50
|
0.50
|
0.678
|
CR‐13/2015
|
65.50
|
66.00
|
0.50
|
1.332
|
CR‐13/2015
|
68.00
|
69.00
|
1.00
|
0.79
|
CR‐13/2015
|
68.00
|
68.50
|
0.50
|
0.148
|
CR‐13/2015
|
68.50
|
69.00
|
0.50
|
1.570
|
CR‐13/2015
|
69.00
|
70.00
|
1.00
|
2.14
|
CR‐13/2015
|
69.00
|
69.50
|
0.50
|
2.924
|
CR‐13/2015
|
69.50
|
70.00
|
0.50
|
0.604
|
CR‐13/2015
|
79.00
|
80.00
|
1.00
|
1.41
|
CR‐13/2015
|
79.00
|
79.50
|
0.50
|
0.399
|
CR‐13/2015
|
79.50
|
80.00
|
0.50
|
1.619
|
CR‐13/2015
|
80.00
|
84.00
|
4.00
|
3.11
|
CR‐13/2015
|
80.00
|
81.00
|
1.00
|
3.730
|
CR‐13/2015
|
81.00
|
82.00
|
1.00
|
3.031
|
CR‐13/2015
|
82.00
|
83.00
|
1.00
|
0.444
|
CR‐13/2015
|
83.00
|
84.00
|
1.00
|
0.229
|
CR‐14/2015
|
8.00
|
12.00
|
4.00
|
0.81
|
CR‐14/2015
|
8.00
|
9.00
|
1.00
|
0.098
|
CR‐14/2015
|
9.00
|
10.00
|
1.00
|
0.633
|
CR‐14/2015
|
10.00
|
11.00
|
1.00
|
1.257
|
CR‐14/2015
|
11.00
|
12.00
|
1.00
|
0.451
|
CR‐14/2015
|
42.00
|
43.00
|
1.00
|
0.98
|
CR‐14/2015
|
42.00
|
42.50
|
0.50
|
0.059
|
CR‐14/2015
|
42.50
|
43.00
|
0.50
|
0.911
|
CR‐15/2015
|
25.00
|
26.00
|
1.00
|
0.57
|
CR‐15/2015
|
25.00
|
25.50
|
0.50
|
0.097
|
CR‐15/2015
|
25.50
|
26.00
|
0.50
|
0.060
|
CR‐15/2015
|
26.00
|
27.00
|
1.00
|
0.91
|
CR‐15/2015
|
26.00
|
26.50
|
0.50
|
0.074
|
CR‐15/2015
|
26.50
|
27.00
|
0.50
|
0.946
|
CR‐16/2015
|
49.00
|
50.00
|
1.00
|
0.86
|
CR‐16/2015
|
49.00
|
49.50
|
0.50
|
0.252
|
CR‐16/2015
|
49.50
|
50.00
|
0.50
|
1.812
|
CR‐16/2015
|
50.00
|
54.00
|
4.00
|
1.22
|
CR‐16/2015
|
50.00
|
51.00
|
1.00
|
0.303
|
CR‐16/2015
|
51.00
|
52.00
|
1.00
|
1.463
|
CR‐16/2015
|
52.00
|
53.00
|
1.00
|
2.866
|
CR‐16/2015
|
53.00
|
54.00
|
1.00
|
0.604
|
CXR‐14/2015
|
37.00
|
38.00
|
1.00
|
0.77
|
CXR‐14/2015
|
37.00
|
37.50
|
0.50
|
0.254
|
CXR‐14/2015
|
37.50
|
38.00
|
0.50
|
1.116
|
CXR‐15/2015
|
58.00
|
59.00
|
1.00
|
0.78
|
CXR‐15/2015
|
58.00
|
58.50
|
0.50
|
0.924
|
CXR‐15/2015
|
58.50
|
59.00
|
0.50
|
0.608
|
CXR‐15/2015
|
59.00
|
60.00
|
1.00
|
0.57
|
CXR‐15/2015
|
59.00
|
59.50
|
0.50
|
0.635
|
CXR‐15/2015
|
59.50
|
60.00
|
0.50
|
0.484
|
CXR‐15/2015
|
62.00
|
63.00
|
1.00
|
1.94
|
CXR‐15/2015
|
62.00
|
62.50
|
0.50
|
3.317
|
CXR‐15/2015
|
62.50
|
63.00
|
0.50
|
0.344
|
ASX RELEASE 23 Oct 2015
Table 1: continued
Old Composite Sample Results
|
New Individual Sample Results
|
Hole ID
|
From
|
To
|
Interval
|
Au_ppm
|
Hole ID
|
From
|
To
|
Interval
|
Au_ppm
|
MR‐06/2015
|
27.00
|
28.00
|
1.00
|
3.641
|
MR‐06/2015
|
27.00
|
28.00
|
1.00
|
3.573
|
MR‐06/2015
|
126.00
|
127.00
|
1.00
|
6.52
|
MR‐06/2015
|
126.00
|
126.50
|
0.50
|
2.325
|
MR‐06/2015
|
126.50
|
127.00
|
0.50
|
11.803
|
MR‐06/2015
|
134.00
|
135.00
|
1.00
|
1.14
|
MR‐06/2015
|
134.00
|
134.50
|
0.50
|
1.436
|
MR‐06/2015
|
134.50
|
135.00
|
0.50
|
0.816
|
MR‐06/2015
|
135.00
|
136.00
|
1.00
|
0.59
|
MR‐06/2015
|
135.00
|
135.50
|
0.50
|
0.591
|
MR‐06/2015
|
135.50
|
136.00
|
0.50
|
0.439
|
MR‐06/2015
|
139.00
|
140.00
|
1.00
|
0.57
|
MR‐06/2015
|
139.00
|
139.50
|
0.50
|
0.948
|
MR‐06/2015
|
139.50
|
140.00
|
0.50
|
0.108
|
MR‐10/2015
|
99.00
|
103.00
|
4.00
|
75.07
|
MR‐10/2015
|
99.00
|
100.00
|
1.00
|
0.837
|
MR‐10/2015
|
100.00
|
101.00
|
1.00
|
0.065
|
MR‐10/2015
|
101.00
|
102.00
|
1.00
|
321.250
|
MR‐10/2015
|
102.00
|
103.00
|
1.00
|
82.249
|
MR‐10/2015
|
103.00
|
107.00
|
4.00
|
16.04
|
MR‐10/2015
|
103.00
|
104.00
|
1.00
|
82.433
|
MR‐10/2015
|
104.00
|
105.00
|
1.00
|
0.733
|
MR‐10/2015
|
105.00
|
106.00
|
1.00
|
0.576
|
MR‐10/2015
|
106.00
|
107.00
|
1.00
|
0.138
|
MR‐10/2015
|
107.00
|
111.00
|
4.00
|
14.27
|
MR‐10/2015
|
107.00
|
108.00
|
1.00
|
10.182
|
MR‐10/2015
|
108.00
|
109.00
|
1.00
|
1.624
|
MR‐10/2015
|
109.00
|
110.00
|
1.00
|
0.440
|
MR‐10/2015
|
110.00
|
111.00
|
1.00
|
0.361
|
QR‐27/2015
|
16.00
|
20.00
|
4.00
|
0.63
|
QR‐27/2015
|
16.00
|
17.00
|
1.00
|
0.068
|
QR‐27/2015
|
17.00
|
18.00
|
1.00
|
0.036
|
QR‐27/2015
|
18.00
|
19.00
|
1.00
|
0.734
|
QR‐27/2015
|
19.00
|
20.00
|
1.00
|
2.221
|
QR‐27/2015
|
20.00
|
24.00
|
4.00
|
0.58
|
QR‐27/2015
|
20.00
|
21.00
|
1.00
|
1.082
|
QR‐27/2015
|
21.00
|
22.00
|
1.00
|
0.688
|
QR‐27/2015
|
22.00
|
23.00
|
1.00
|
0.371
|
QR‐27/2015
|
23.00
|
24.00
|
1.00
|
0.185
|
QR‐28/2015
|
48.00
|
49.00
|
1.00
|
3.00
|
QR‐28/2015
|
48.00
|
48.50
|
0.50
|
0.345
|
QR‐28/2015
|
48.50
|
49.00
|
0.50
|
2.503
|
QR‐28/2015
|
49.00
|
50.00
|
1.00
|
16.21
|
QR‐28/2015
|
49.00
|
49.50
|
0.50
|
34.065
|
QR‐28/2015
|
49.50
|
50.00
|
0.50
|
0.566
|
QR‐29/2015
|
30.00
|
31.00
|
1.00
|
2.24
|
QR‐29/2015
|
30.00
|
30.50
|
0.50
|
3.250
|
QR‐29/2015
|
30.50
|
31.00
|
0.50
|
1.277
|
QR‐29/2015
|
31.00
|
32.00
|
1.00
|
0.65
|
QR‐29/2015
|
31.00
|
31.50
|
0.50
|
1.133
|
QR‐29/2015
|
31.50
|
32.00
|
0.50
|
0.121
|
QR‐29/2015
|
32.00
|
33.00
|
1.00
|
0.61
|
QR‐29/2015
|
32.00
|
32.50
|
0.50
|
0.803
|
QR‐29/2015
|
32.50
|
33.00
|
0.50
|
0.176
|
QR‐29/2015
|
33.00
|
34.00
|
1.00
|
0.59
|
QR‐29/2015
|
33.00
|
33.50
|
0.50
|
1.012
|
QR‐29/2015
|
33.50
|
34.00
|
0.50
|
0.101
|
ASX RELEASE 23 Oct 2015
Composite sample versus Individual Sample Assay Comparison
1000.00
y = 0.0073x2 + 0.8013x + 0.0715 R² = 0.9855
100.00
Individual Sample results (re‐composited g/t gold)
10.00
1.00
0.10 1.00 10.00 100.00
0.10
Composite Sample results (original g/t gold)
Figure 2: Graph showing the composite samples versus the individual samples (re‐composited for comparison purposes). No obvious bias is detected and the polynomial line of best fit shows strong correlation.
Prospect
|
Hole ID
|
Final Depth
|
Easting
|
Northing
|
RL
|
Azimuth
|
Dip
|
From (m)
|
To (m)
|
Interval (m)
|
Au g/t
|
Comments
|
DONA MARIA
|
MD‐ 01/2015
|
199.78
|
328194
|
8990109
|
227
|
270
|
‐60
|
179
|
187
|
8
|
21.76
|
inc.
|
179
|
180
|
1
|
2.439
|
New Intersection
|
inc.
|
180
|
181
|
1
|
0.682
|
New Intersection
|
inc.
|
181
|
182
|
1
|
4.706
|
New Intersection
|
inc.
|
182
|
183
|
1
|
3.775
|
New Intersection
|
inc.
|
183
|
183.62
|
0.62
|
0.586
|
New Intersection
|
inc.
|
183.62
|
184.59
|
0.97
|
57.724
|
inc.
|
184.59
|
185.49
|
0.9
|
113.36
|
inc.
|
185.49
|
186.38
|
0.89
|
3.258
|
inc.
|
186.38
|
187
|
0.62
|
1.953
|
QUEROSENE
|
QD‐05/2015
|
200.45
|
329648
|
8989477
|
244
|
90
|
‐55
|
88.46
|
89.49
|
1.03
|
58.24
|
New Intersection
|
110.7
|
111.2
|
0.5
|
7.02
|
179.1
|
179.3
|
0.2
|
4.81
|
Table 2: Significant intercepts from Juruena Project
ASX RELEASE 23 Oct 2015
For further information please contact:
Mr. Rob Smakman Mr. Paul Stephen
Managing Director, Brazil Executive Director, Australia
Office (Brazil): +55 31 2515 0740 Office (Aus): +61 8 9320 7500 Email: [email protected] Email: [email protected]
About Crusader
Crusader Resources Limited (ASX:CAS) is a minerals exploration and mining company listed on the Australian Securities Exchange. Its major focus is Brazil; a country Crusader believes is vastly underexplored and which offers high potential for the discovery of world class mineral deposits.
Crusader has three key assets:
Juruena Gold
The Juruena Gold Project is located in the highly prospective Juruena‐Alta Floresta Gold Belt, which stretches east‐west for >400km and has historically produced more than 7Moz of gold from 40 known gold deposits.
The Juruena Project has been worked extensively by artisanal miners (garimpeiros) since the 1980s, producing ~500koz in that time. Historically there is a database of more than 30,000 meters of drilling and extensive geological data.
Posse Iron Ore
The Posse Iron Ore Mine is located 30km from Belo Horizonte, a city acknowledged as the mining capital of Brazil and the capital of Minas Gerais state. The project had an indicated and inferred Mineral Resource estimate of 36Mt @ 43.5% Fe when mining began in March 2013. Posse is currently selling DSO into the domestic market. With an experienced mining workforce amongst a population of over 2.5 million people, the infrastructure and access to the domestic steel market around the Posse Project is excellent.
Borborema Gold
The Borborema Gold Project is in the Seridó area of the Borborema province in north‐eastern Brazil. It is 100% owned by Crusader and consists of three mining leases covering a total area of 29 km² including freehold title over the main prospect area.
The Borborema Gold Project benefits from a favourable taxation regime, existing on‐site facilities and excellent infrastructure such as buildings, grid power, water, sealed roads and is close to major cities and regional centres. The project's Ore Reserve includes Proven and Probable Ore Reserves of 1.61Moz of mineable gold from 42.4Mt @ 1.18g/t (0.4 & 0.5g/t cut‐offs for oxide & fresh).
The measured, indicated and inferred Mineral Resource Estimate of 2.43Moz @ 1.10g/t gold, remains open in all directions.
Competent Person Statement
The information in this report that relates to Juruena Gold Project exploration results, Posse Iron Ore Project exploration results and Borborema Gold Project exploration results released after 1 December 2013, is based on information compiled or reviewed by Mr.. Robert Smakman who is a full time employee of the company and is a Fellow of the Australasian Institute of Mining and Metallurgy. The information in this report that relates to Mineral Resources at the Juruena Gold Project is based on information compiled or reviewed by Mr. Lauritz Barnes and Mr. Aidan Platel who are independent consultants to the company and Members of the Australasian Institute of Mining and Metallurgy. Each of Mr. Smakman, Mr. Barnes and Mr. Platel have sufficient experience that is relevant to the type of mineralisation and type of deposits under consideration to qualify as a Competent Person as defined in the 2012 edition of the Australasian Code for Reporting of Exploration Results, Mineral Resources and Ore Reserves. Mr. Smakman, Mr. Barnes and Mr. Platel consent to the inclusion in the report of the matters based on his information in the form and context in which it appears.
The information in this report that relates to:
-
Borborema Gold Project and Posse Iron Ore Project Exploration Results released prior to 1 December 2013 is based on information compiled or reviewed by Mr. Robert Smakman who is a full time employee of the company;
-
Borborema Gold Mineral Resources is based on information compiled by Mr. Lauritz Barnes and Mr. Brett Gossage, independent consultants to the company;
-
Borborema Gold Ore Reserves is based on information compiled by Mr. Linton Kirk, independent consultant to the company;
-
Posse Fe Mineral Resources is based on and accurately reflects, information compiled by Mr. Bernardo Viana who was a full time employee of Coffey Mining Pty Ltd,
and who are all Members of the Australasian Institute of Mining and Metallurgy (Rob Smakman and Linton Kirk being Fellows), and who all have sufficient experience that is relevant to the type of mineralisation and type of deposit under consideration, and to the activity which they are undertaking to qualify as a Competent Person as defined in the 2004 edition of the Australasian Code for Reporting of Exploration Results, Mineral Resources and Ore Reserves. Each of Mr. Smakman, Mr. Barnes, Mr. Kirk, Mr. Viana, and Mr. Brett Gossage consent to the inclusion in the report of the matters based on their information in the form and context in which it appears.
The information was prepared and disclosed under the JORC Code 2004. It has not been updated since to comply with JORC Code 2012 on the
basis that the information has not materially changed since it was last reported
ASX RELEASE 23 Oct 2015
Juruena Gold Project JORC Code, 2012 Edition Section 1. Sampling Techniques and Data
(Criteria in this section apply to all succeeding sections)
Criteria JORC Code Explanation Commentary
|
Sampling Techniques
Drilling techniques
|
-
Nature and quality of sampling (e.g. cut channels, random chips, or specific specialised industry standard measurement tools appropriate to the minerals under investigation, such as downhole gamma sondes, or handheld XRF instruments, etc.). These examples should not be taken as limiting the broad meaning of sampling.
-
Include reference to measures taken to ensure sample representivity and the appropriate calibration of any measurement tools or systems used.
-
Aspects of the determination of mineralisation that are Material to the Public Report.
-
In cases where 'industry standard' work has been done this would be relatively simple (e.g. 'reverse circulation drilling was used to obtain 1 m samples from which 3 kg was pulverised to produce a 30 g charge for fire assay'). In other cases more explanation may be required, such as where there is coarse gold that has inherent sampling problems. Unusual commodities or mineralisation types (e.g. submarine nodules) may warrant disclosure of detailed information.
-
Drill type (e.g. core, reverse circulation, open‐hole hammer, rotary air blast, auger, Bangka, sonic, etc.) and details (e.g. core diameter, triple or standard tube, depth of Diamond tails, face‐ sampling bit or other type, whether core is oriented and if so, by what method, etc.).
|
-
Reverse circulation (RC) drill sample: samples were collected at one metre intervals and locally, in the proximity of the main target zone, at 0.5m intervals. In zones of little apparent interest, samples were composited in 4m intervals for submission to the laboratory and 3 ‐ 4kg duplicates of the individual 1m or 0.5m samples retained for future analysis, if required. These are the sample which were sent to the lab for single interval analysis. The sample material passed through a 3 stage Jones riffle splitter. Samples were kept relatively dry through the use of a booster compressor to maintain a high level of air pressure.
-
Diamond drill sample: Diamond core was split in half lengthways and sampled typically at 1m intervals, although sampling was to geological boundaries and hence sample length ranged from
0.2 ‐ 2.0m. Samples were placed in high density plastic sample bags and immediately sealed shut with cable ties.
-
A 1.5 ‐ 2.5kg sample was collected into a high density plastic bag before being sent for analysis, FAA (50g charge) for gold only and ICP‐MS (15g charge). All efforts were made to ensure sample contamination was minimised and that all samples could be deemed representative of the interval that they originated from. Based on statistical analysis of field duplicates, there is no evidence to suggest samples are not representative.
-
Sampling procedures followed by historic operators were in line with industry standards at the time (personal communication with senior staff in charge of previous work), as are Crusader's current procedures.
-
Crusader completed 73 RC drill‐holes in 2014 and 2015 (7,749.50m) using a nominal 5 ½ inch face sampling hammer. Hole conditions were mostly dry, with sufficient air pressure available to keep water from entering the drill‐hole. Where high water inflows potentially threatened sample integrity, the drill‐hole was abandoned and subsequently re‐drilled with a Diamond rig . Drill‐ hole inclinations ranged from ‐55 to ‐67 degrees. In early 2015 Crusader also completed 11 Diamond drill‐holes (1,863.81m) of NQ2 diameter with HQ pre‐collars in unconsolidated material.
|
Section 1 ‐ continued
ASX RELEASE 23 Oct 2015
Criteria JORC Code Explanation Commentary
|
Drilling Techniques (cont.)
|
-
Down‐hole surveys were completed for the Diamond drill‐holes, but the core was not oriented.
-
Crusader's resource drill‐hole database includes 90 RC drill‐holes (6,618m) and 70 Diamond drill‐ holes (22,497.81m) completed between 2010 and 2013 by Lago Dourado Minerals Ltd ('Lago'). The RC drill‐holes were drilled with a nominal 5 inch face sampling hammer, and the Diamond drill‐holes were of NQ2 diameter with HQ pre‐collars. All Diamond core was oriented, initially with a spear and subsequently with a Reflex ACT II instrument. Drill‐hole inclinations ranged from
-
Crusader's resource drill‐hole database also includes 91 Diamond drill‐holes (15,821.89m) completed between 1994 and 1998 by Madison Minerals Ltd ('Madison'). The Diamond drill‐ holes were of NQ2 diameter with HQ pre‐collars. Drill‐hole inclinations ranged from ‐45 to ‐62 degrees.
‐50 degrees to vertical.
|
Drill sample recovery
|
-
Method of recording and assessing core and chip sample recoveries and results assessed.
-
Measures taken to maximise sample recovery and ensure representative nature of the samples.
-
Whether a relationship exists between sample recovery and grade and whether sample bias may have occurred due to preferential loss/gain of fine/coarse material.
|
-
RC drill sample recoveries were verified by weighing every sample; Diamond core recovery by measuring the length of core recovered compared to the drill run. For the whole database (i.e. combined Crusader and Lago drill‐holes) over 90% of measured recoveries are above 80%.
-
For both Crusader and Lago drill‐holes, recovery data has been recorded, and field duplicates submitted and analysed. No sample recovery information is available for Madison
-
Gold mineralisation does not apparently correlate to zones of low sample recovery; sample bias due to poor sample recovery is therefore not believed to be an issue.
|
Logging
|
-
Whether core and chip samples have been geologically and geotechnically logged to a level of detail to support appropriate Mineral Resource estimation, mining studies and metallurgical studies.
-
Whether logging is qualitative or quantitative in nature. Core (or costean, channel, etc.) photography.
-
The total length and percentage of the relevant intersections logged.
|
-
All Crusader and Lago drill‐holes have been geologically and geotechnically (core) logged in detail, and the data stored in a digital database. Summary logs exist for the Madison holes.
-
Logging of Diamond drill‐core and RC samples recorded lithology, mineralogy, mineralisation, structure (core only), weathering and colour. Core photographs also exist for all drill‐holes.
-
Lithological data exists for all Crusader, Lago and Madison drill‐holes in the database that were utilized in the resource estimation.
|
Section 1 ‐ continued
ASX RELEASE 23 Oct 2015
Criteria JORC Code Explanation Commentary
|
Sub‐sampling techniques and sample preparation
|
-
If core, whether cut or sawn and whether quarter, half or all core taken. If non‐core, whether riffled, tube sampled, rotary split, etc. and whether sampled wet or dry.
-
For all sample types, the nature, quality and appropriateness of the sample preparation technique.
-
Quality control procedures adopted for all sub‐sampling stages to maximise representivity of samples.
-
Measures taken to ensure that the sampling is representative of the in situ material collected, including for instance results for field duplicate/second‐ half sampling.
-
Whether sample sizes are appropriate to the grain size of the material being sampled.
|
-
RC samples were collected using a 3‐stage Jones riffle splitter, a high density plastic bag was placed directly over the sample chute on the rifle splitter. The sample size was 3‐4 kilograms and the size of the chips was predominantly 0.4‐0.8 centimetres with a few chips greater than this. The comportment of gold is fine and evenly distributed normally associated with fine disseminated sulphides. Sampling was generally conducted on dry samples.
-
Diamond drill‐core was cut in half lengthways on site using a Diamond saw; for duplicate samples quarter‐core was used.
-
Sample preparation was undertaken by SGS‐Geosol Laboratories ('SGS') in Brazil for Crusader samples and Acme Analytical Laboratories ('Acme') in Brazil for Lago samples. Madison used SGS in Brazil for sample preparation and analysis with check assaying performed at X‐RAL labs in Toronto. All used industry standard methods (dry - crush - split - pulverise) which are considered appropriate for the style of mineralisation intersected in the drill‐holes. The sample preparation method used by SGS‐Geosol laboratories is presented in the following section.
-
Standards (certified reference material), blanks and duplicates were inserted into the sample stream at the rate of 1:25, 1:25 and 1:40 samples, respectively for both Crusader and Lago drill‐ holes.
|
Quality of assay data and laboratory tests
|
-
The nature, quality and appropriateness of the assaying and laboratory procedures used and whether the technique is considered partial or total.
-
For geophysical tools, spectrometers, handheld XRF instruments, etc., the parameters used in determining the analysis including instrument make and model, reading times, calibrations factors applied and their derivation, etc.
-
Nature of quality control procedures adopted (eg standards, blanks, duplicates, external laboratory checks) and whether acceptable levels of accuracy (ie lack of bias) and precision have been established.
|
-
SGS were used by Crusader for all analyses.
-
The samples were assayed for Au by Fire Assay of 50g aliquots followed by Atomic Absorption Spectroscopy (AAS), a technique designed to report total gold.
-
No geophysical tools were used to determine any element concentrations.
-
The coarse and pulp sample rejects from the preparation and analytical laboratories were retained and stored at the laboratory, allowing for re‐assaying in the future if required. Splits of all samples were stored in secure heavy duty plastic bags in an enclosed storage facility on‐site at the Juruena Project.
|
Section 1 ‐ continued
ASX RELEASE 23 Oct 2015
Criteria JORC Code Explanation Commentary
|
Quality of assay data and laboratory tests (cont.)
|
-
Quality Control procedures were adopted by both Lago and Crusader including field duplicates (1 every 40 samples), blanks (1 every 25 samples) and standards (1 every 25 samples). Field duplicates are defined as a second sample split via the riffle splitter at the drill rig for RC samples, or quarter core samples for the Diamond drill‐holes.
-
Crusader employees took 18 samples from drilling at Querosene were re‐split (from the coarse rejects) and submitted to ALS labs in Brazil. Samples included low, medium and very high‐grade samples. Results were very close to the original sample results in the Lago Dourado database.
|
Verification of sampling and assaying
|
-
The verification of significant intersections by either independent or alternative company personnel.
-
The use of twinned holes.
-
Documentation of primary data, data entry procedures, data verification, data storage (physical and electronic) protocols.
-
Discuss any adjustment to assay data.
|
-
Significant intercepts were generated by Crusader personnel and verified by Rob Smakman, the qualified person for previous releases comprising the significant intersections.
-
A number of RC drill‐holes were partially twinned by Diamond drill‐holes; the drill‐holes compare well visually, but it. was not possible to compare assay results due to lack of sampling. This has been flagged for ongoing work
-
No adjustments or calibrations were made to any assay data used in this estimate.
All drill‐hole data are recorded in Microsoft Excel spreadsheets and then stored in a digital database (Microsoft Access). Only Crusader's database administrator has the capacity to enter or change data. Standardised geological codes and checks have been employed to ensure standardised geological logging and required observations performed. The database is stored on a central server which is backed up weekly. Work procedures exist for all actions concerning data management.
All historical (Lago) drill‐hole data were sourced from Lago data files; Crusader is in possession of the original electronic laboratory files.
Original text files for assay, collar and survey were received for the Madison drilling. Original maps and reports and digital data were received from Lago Dourado.
|
Location of data points
|
-
Accuracy and quality of surveys used to locate drill holes (collar and downhole surveys), trenches, mine workings and other locations used in Mineral Resource estimation.
-
Specification of the grid system used.
-
Quality and adequacy of topographic control.
|
-
Collar surveys have been used from the supplied database. Where discrepancies occurred, these coordinates were edited only after checking against hard copy logs and survey field pick‐ups. This process will continue as part of the database enrichment. All drill‐holes have been checked spatially in 3D and all obvious errors addressed.
-
The grid system used for all data types, was in a UTM projection, Zone 21 Southern Hemisphere and datum South American 1969. No local grids are used.
-
Topographic control in the area is basic. The topographic surface was sourced from digital satellite imagery (Aster). Further surveying work is planned prior to future resource estimation work.
|