Rye
Patch Reports Metallurgical Results From Wilco
Vancouver, British
Columbia, July 27, 2011 - Rye Patch Gold Corp (TSX.V: RPM; OTCQX: RPMGF) ("Rye
Patch" or the "Company") reports the results of CIL bottle
roll tests and diagnostic leaching from the Section Line resource and North
Basin drill target.
HIGHLIGHTS
- Gold recoveries from CIL bottle roll testing shows
50% to 92% gold recovery within the Section Line resource;
- Silver recoveries from CIL bottle roll testing
returned 25% to 88% silver recovery within the Section Line resource;
- Gold extractions associated with diagnostic leach
testing range from 73% to 91% for direct cyanide leaching and simple
sulfide leaching;
- Overall gold extractions associated with diagnostic
leach through all testing ranged from 79% to 96%; and
- The majority of the gold within the Section Line and
North Basin target is associated with native gold occurring on the
outside of veins and mineral grain boundaries
DISCUSSION
Seventeen composite samples were submitted to Kappes, Cassidy and Associates
(KCA) in Reno, Nevada, for CIL bottle roll testing and diagnostic
metallurgical testing. Nine composites are from the Section Line resource and
consist of reverse circulation and core samples. In the North Basin area,
eight composites were selected from reverse circulation drilling in the target
area. As a final analysis, five composites were selected for diagnostic
leaching -- two from North Basin and three from the Section Line resource.
The results of the CIL bottle-roll analyses conform well with Rye Patch
Gold's oxide domain model used in the resource estimate. The axial zone of
the Section Line anticline contains the bulk of the oxide material. As
mineralization moves outward along the limbs of the antiform, oxidation
attenuates to the north toward the North Basin target. The bulk of the Section
Line resource sits within the anticline and is open to the west. Higher grade
are along the northern limb of the anticline. Table 1 summarizes CIL bottle
roll gold and silver extractions.
"I am very pleased
with the results of the bottle roll test and quite excited by the diagnostic
leach tests. Both analyses show the gold and silver are associated with free
gold and simple sulfides which can be treated using existing technologies
employed in gold mining in Nevada. Obviously, additional testing is required
to fully understand the gold and maximize value from the deposit; however,
this is an excellent first step", stated William C. (Bill)
Howald, the Company's President and CEO.
Table 1: CIL Bottle Roll Leach Tests; Summary of Gold and Silver Extractions
Sample
ID
|
Sample
Type
|
Drill
Interval
|
Head
Au opt
|
Extracted
Au %
|
Head
Ag opt
|
Extracted
Ag %
|
Consumption
NaCN
lbs/st
|
Add'l
Ca(OH)2 lbs/st
|
Area
|
WR-040
|
RC
|
130-250
|
0.095
|
92%
|
0.05
|
45%
|
4.02
|
1.50
|
Section Line
|
WR-040
|
RC
|
250-305
|
0.024
|
90%
|
0.07
|
25%
|
3.33
|
1.50
|
Section Line
|
WRC-1/2/3
|
Core
|
229-281,199-219,182-201.5
|
0.018
|
65%
|
0.31
|
77%
|
3.31
|
2.50
|
Section Line
|
WRC-3
|
Core
|
201.5-235
|
0.038
|
66%
|
0.24
|
26%
|
3.00
|
1.50
|
Section Line
|
WRC-1
|
Core
|
598-623.5
|
0.015
|
69%
|
0.13
|
66%
|
2.50
|
1.50
|
Section Line
|
WRC2/3
|
Core
|
556-596,574-590
|
0.034
|
55%
|
0.34
|
75%
|
3.01
|
1.50
|
Section Line
|
WRC-4
|
Core
|
209-602
|
0.018
|
54%
|
0.10
|
67%
|
2.65
|
1.50
|
Section Line
|
WRC-4
|
Core
|
602-623
|
0.016
|
50%
|
0.10
|
58%
|
2.48
|
1.50
|
Section Line
|
WRC-4
|
Core
|
536-712
|
0.034
|
60%
|
0.17
|
88%
|
2.58
|
1.50
|
Section Line
|
WR-081
|
RC
|
1120-1160
|
0.047
|
59%
|
0.24
|
75%
|
2.84
|
1.50
|
North Basin
|
WR-081
|
RC
|
1210-1240
|
0.030
|
20%
|
0.10
|
22%
|
3.35
|
2.00
|
North Basin
|
WR-098
|
RC
|
1090-1190
|
0.047
|
48%
|
0.20
|
6%
|
2.84
|
2.00
|
North Basin
|
WR-105
|
RC
|
410-500
|
0.012
|
55%
|
0.12
|
48%
|
3.50
|
1.50
|
North Basin
|
WR-105
|
RC
|
1105-1165
|
0.048
|
44%
|
0.56
|
72%
|
3.19
|
2.00
|
North Basin
|
WR-081
|
RC
|
1160-1210
|
0.076
|
59%
|
1.03
|
79%
|
3.19
|
1.00
|
North Basin
|
WR-098
|
RC
|
1155-1210
|
0.039
|
47%
|
0.10
|
36%
|
2.91
|
2.00
|
North Basin
|
WR-098
|
RC
|
1100-1155
|
0.040
|
62%
|
0.11
|
64%
|
3.02
|
1.50
|
North Basin
|
In addition to the CIL bottle roll analysis, KCA performed diagnostic
leaching on five samples -- WR-081, WR-105, WRC-1, WRC-2/3 and WRC-4.
Diagnostic leach testing is designed to determine the metal association
within a sample material by leaching the material in six stages with various
pretreatments for each stage. Following the pretreatments, the residues were
leached in CIL bottle roll tests with 10 pound per ton (5.0 gram per liter)
sodium cyanide solution.
The remaining gold not leached in any stage of the diagnostic testing was
presumed to be encapsulated in the remaining minerals. The test work was
conducted utilizing material pulverized to a target 80% passing 200 mesh
Tyler. Accordingly, if the particle size were reduced to a finer size than
that utilized for this test work, the gold extraction should increase.
Table 2: Comparison of Diagnostic Direct Leach Au Extraction and CIL Bottle
Roll Au Extraction
KCA Sample No.
|
Diagnostic Direct Leach
Au Extracted
|
Previous CIL
Au Extracted
|
WR-081
|
14%
|
20%
|
WR-105
|
50%
|
55%
|
WRC-1
|
83%
|
69%
|
WRC2/3
|
62%
|
55%
|
WRC-4
|
54%
|
50%
|
The results of the diagnostic leach test work are shown in the graph form
below.

Three of the five composites tested showed an increase in the gold extraction
during the direct leach stage of the diagnostic program versus the previously
conducted CIL. The other two composites showed a decrease in the gold
extraction versus the previous CIL tests. The tests differed in two areas,
cyanide concentration and leach time. These results suggest some composites
responded better to increased cyanide additions while others responded better
to increased leach periods.
Four of the five composites tested showed the majority of gold extraction
occurred during the direct cyanide leach. In four of the five composites, the
gold associated with arsenopyrite and some pyrite constituted the second
largest contribution to overall extraction. The overall gold extractions in
the diagnostic leach tests ranged from 79% to 96%. Notably, 73% to 91% of the
total gold extraction in the diagnostic leach testing was attributed to the
direct cyanide and arsenopyrite leach stages.The gold extractions associated
with the diagnostic leach testing from direct cyanide leaching through simple
sulfide leaching ranged from 73% to 91% and the overall extractions through
all testing ranged from 79% to 96%.
PROCEDURES
The procedure utilized for the CIL bottle roll testing is as follows. First,
a 1,000 gram portion of pulverized material was placed into a 2.5 liter
bottle and slurried with the addition of 1,500 milliliters of water and 75
grams of granular activated carbon (GAC). The slurry was mixed thoroughly and
the pH of the slurry was checked. The pH of the slurry was adjusted, as
required, to 11.0 with hydrated lime.
Sodium cyanide was added to the slurry to equal 2 pounds per ton of water
added (1.0 grams per liter). The bottle was then placed onto a set of
laboratory-rolls. Rolling throughout the duration of the test mixed the
slurry. The slurry was checked at 2, 4, 8, 24, 48, 72 and 96 hours for pH,
dissolved oxygen (DO), NaCN, Au, Ag and Cu.
After completion of the leach period, the slurry was screened to remove the
carbon. The screened slurry was then washed, filtered and dried.
Duplicate portions were split from the tailings and assayed for residual gold
and silver content. The screened carbon was dried and assayed for gold and
silver content. The results of the bottle roll leach test are summarized in
Table 1.
Diagnostic leach testing is designed to determine the metal association
within a sample material by leaching the material in six stages with various
pretreatments for each stage. For this testing, five (5) separate composite
samples were selected based on location. Leaching was conducted on a
pulverized (80% passing 200 mesh Tyler) portion of material from each
composite.
As announced on May 18, 2010, May 11, 2009, and June 2, 2009, in respect of
the Lincoln Hill, Wilco, and Jessup projects, Rye Patch Gold's resource
inventory along the Oreana trend now totals 1,182,780 ounces of gold and gold
equivalent in the measured and indicated category plus 2,727,100 ounces of
gold and gold equivalent in the inferred category. Table 2 summarizes Rye
Patch Gold's precious metal inventory in Nevada, USA.
Table 2: Rye Patch Gold's NI43-101
Resource Inventory (1)
|
Property
|
Resource
Category
|
Tonnes (X 1,000)
|
Gold Grade (g/t)
|
Silver Grade (g/t)
|
Contained Gold Ounces
|
Contained Silver Ounces
|
Contained Gold & Gold Equivalent
Ounces (4)
|
Wilco (2)
|
Measured
|
7,526
|
0.69
|
4.595
|
164,000
|
1,111,000
|
186,220
|
Indicated
|
30,844
|
0.51
|
3.601
|
522,000
|
3,638,000
|
594,760
|
Inferred
|
121,838
|
0.41
|
5.075
|
1,660,000
|
19,871,000
|
2,057,420
|
Jessup(2)
|
Measured
|
7,775
|
0.51
|
8.745
|
128,000
|
2,184,000
|
171,680
|
Indicated
|
12,642
|
0.41
|
7.167
|
172,000
|
2,906,000
|
230,120
|
Inferred
|
4,494
|
0.55
|
7.922
|
77,000
|
1,146,000
|
99,920
|
Lincoln Hill (3)
|
Measured
|
-
|
-
|
-
|
-
|
-
|
-
|
Indicated
|
-
|
-
|
-
|
-
|
-
|
-
|
Inferred
|
17,215
|
0.69
|
17.143
|
380,000
|
9,488,000
|
569,760
|
Total Oreana Trend Measured &
Indicated Resources
|
986,000
|
9,839,000
|
1,182,780
|
Total Oreana Trend Inferred Resources
|
2,117,000
|
30,505,000
|
2,727,100
|
(1) All resources on 100% basis.
Metallurgical recoveries and net smelter returns are assumed to be 100%.
Conforms to 43-101 resource definitions;
|
(2) Cutoff grade for Wilco Measured and
Indicated resource is reported at 0.2 g/t Au for oxide mineralisation and
1.45 g/t Au for sulphide mineralisation. The Inferred resource cut-off
grade is reported at 0.2 g/t Au for oxide, sulphide and carbonaceous ore
types; however, a higher opt Au cut-off grade may be required to upgrade
the inferred resource to the measured and indicated resource category.
Cut-off grade for Jessup is reported at 0.2 g/t Au for oxide mineralisation
and 0.34 g/t Au for transition and sulphide mineralisation; and
|
(3) The Inferred resource is reported
at a cut-off grade of 0.34 g/t (0.01 opt) Aueq for oxide and transitional
ore types;
|
(4) Wilco, Jessup and Lincoln Hill
resources includes Au equivalent ounces (Aueq.); where Aueq. = (Au ozs) +
(Ag ozs X $Ag/oz)/$Au/oz, for Au/oz = $900, and Ag/oz = $18.
|
Mr. William Howald, AIPG Certified Professional Geologist #11041, Rye Patch
Gold's CEO and President, is a Qualified Person as defined under National
Instrument 43-101. He has verified the information contained in, and has
reviewed and approved the contents of, this news release.
Rye Patch Gold Corp. is exploring well-known mineral trends in Nevada - the
world's fourth-richest gold region. Starting with 150,000 inferred ounces of
gold in mid-2007, this well-funded Company now has 1.2-million ounces of gold
and gold equivalent in the measured and indicated category, plus 2.7-million
ounces of gold and gold equivalent in the inferred category. Rye Patch Gold
is a Tier 1, Nevada-focused and discovery-driven company seeking to build a
sizeable inventory of gold and silver resource assets in the mining friendly
state of Nevada, USA. The Company's seasoned management team is engaged in
acquisition, exploration and development of quality resource-based gold and
silver projects. Rye Patch Gold is developing its primary assets -- the
advanced-stage Wilco, Lincoln Hill, Jessup, and Gold Ridge projects located
along the emerging Oreana gold trend in west-central Nevada. The Company has
established gold and silver resource milestones and time frames in order to
build a premier resource development company. For more information about Rye
Patch Gold, please visit our website at www.ryepatchgold.com .
On behalf of the Board of Directors
'William Howald'
William C. (Bill) Howald, CEO & President
For additional information contact:
Rye Patch Gold Corp
info@ryepatchgold.com
Tel.: 604-638-1588 Fax: 604-6381589
This news release contains
forward-looking statements, which address future events and conditions, which
are subject to various risks and uncertainties. The Company's actual results,
programs and financial position could differ materially from those
anticipated in such forward-looking statements as a result of numerous
factors, some of which may be beyond the Company's control. These factors
include: the availability of funds; the timing and content of work programs;
results of exploration activities and development of mineral properties, the
interpretation of drilling results and other geological data, the
uncertainties of resource and reserve estimations, receipt and security of
mineral property titles; project cost overruns or unanticipated costs and
expenses, fluctuations in metal prices; currency fluctuations; and general
market and industry conditions.
Forward-looking statements
are based on the expectations and opinions of the Company's management on the
date the statements are made. The assumptions used in the preparation of such
statements, although considered reasonable at the time of preparation, may
prove to be imprecise and, as such, undue reliance should not be placed on
forward-looking statements.
Neither TSX Venture
Exchange nor its Regulation Services Provider (as that term is defined in the
policies of the TSX Venture Exchange) accepts responsibility for the adequacy
or accuracy of this release.
Suite 1740 - 1177 West Hastings
St., Vancouver, BC, V6E 2K3, Canada
Phone 604-638-1588 Fax
604-638-1589 www.ryepatchgold.com
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