Rio Alto Mining Limited

Published : January 23rd, 2008

Reports further drill results from the Vallecillo drill program

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January 23, 2008

Mexican Silver Reports Further Drill Results from the Vallecillo Drill Program



DRILLING AND MAPPING / SAMPLING AT VALLECILLO DELINEATES A 3.5 KM LONG ZONE OF MINERALIZATION

Mexican Silver Mines Ltd. ("Mexican Silver") (TSXV: MSM; Frankfurt WKN: A0MSLE) has received assay results from drill holes V-05, V-06, V-11, V-12 and V-13 of its 13-hole phase 1 drill program recently completed on its Vallecillo project.  A total of 3,081 meters were drilled by Mexican Silver in this phase of the Vallecillo drilling program.  Mexican Silver highlighted certain assay results from drill holes V-01, V-02, V-03, and V-04 in its December 5, 2007 news release.  Results remain pending for drill holes V-07, V-08, V-09, and V-10.


The Vallecillo district has been the site of silver-lead mining activities dating back to 1776, where mineralization is hosted within structures and mantos of the Eagle Ford formation in a sequence of interbedded limestones and silty carbonates. The largest historic mine in the district, the Dolores mine, has a known depth of 100 metres. All the other mines in the area, all located on Mexican Silver's Providencia property, have been mined from to depths of ranging from 5 to 20 meters. These historic mines were restricted in depth to the water table due to inadequate mining and water management techniques at the time. The Vallecillo district is located in the southern part of the Mexican Silver's100-per-cent-owned Providencia concession.

The assay results for these nine drill holes indicate a strong mineralized system at Vallecillo with a strike length of at least 3.5 km, which is open along strike and to depth.

To date, all holes except for V-05 have encountered mineralization and anomalous indications of the mineralizing system, across considerable widths. Conclusions about the geometry of the system can already be drawn and which suggest the design of the second phase of the drill program at Vallecillo.  A final appraisal of the phase 1 drill program and planning of the second phase will be undertaken following receipt of the assay results for the remaining four drill holes.

The following tables show the material assay results of drill holes V-01, V-02, V-03, V-04, V-05, V-06, V-11 and V-12.

Drill Hole

V-01

Azimuth:

145º

Dip

-70º

 Collar Coordinates:

Northing

2,949,867 m

Easting

402,331 m

 From

m

To
M

Interval
m

Silver
gm/tonne

Lead
ppm

Zinc
ppm

 69.0

71.0

2.00

13.3

7,600

80

 85.0

87.0

2.00

3.1

1,690

226

 93.0

95.0

2.00

3.7

2,570

67

 162.05

163.35

1.30

6.8

1,570

11,500

 

Drill Hole

V-02

Azimuth:

145º

Dip

-70º

 Collar Coordinates:

Northing

2,949,962 m

Easting

402,332 m

 From
m

To
M

Interval
m

Silver
gm/tonne

Lead
ppm

Zinc
ppm

 211.80

212.80

1.00

3.6

105

715

 219.90

220.85

0.95

2.8

32

76

 220.85

221.85

1.00

2.9

55

112

 221.85

222.80

0.95

4.4

133

31

 246.00

248.00

2.00

4.0

982

21

 248.00

250.00

2.00

2.0

152

34

 

Drill Hole

V-03

Azimuth:

145º

Dip

-55º

 Collar Coordinates:

Northing

2,949,841 m

Easting

402,166 m

 From
m

To
M

Interval
m

Silver
gm/tonne

Lead
ppm

Zinc
ppm

 162.30

163.50

1.20

136

95,200

3,780

 164.85

166.30

1.45

3.9

1,690

108

 167.30

168.30

1.00

300.0

9,930

2,660

 168.30

169.30

1.00

326.0

7,760

4,010

 169.30

170.75

1.45

21.0

3,110

23,400

 170.75

171.75

1.00

6.7

840

2,650

 171.75

174.20

2.45

7.9

788

850

 174.20

177.20

3.00

16.3

1,020

750

 179.00

181.00

2.00

2.0

155

616

 205.00

207.00

2.00

2.4

123

388

 207.00

209.00

2.00

2.3

103

245

 209.00

211.00

2.00

2.9

113

340

 211.00

213.00

2.00

4.1

189

34

 213.00

215.00

2.00

4.2

166

23

 215.00

216.00

1.00

5.5

40

13

 216.00

217.00

1.00

2.9

42

33

 217.00

219.00

2.00

2.1

25

13

 219.00

221.00

2.00

3.9

29

171

 221.00

223.00

2.00

6.8

53

11

 223.00

225.00

2.00

5.2

99

17

 225.00

227.00

2.00

4.4

147

25

 227.00

229.00

2.00

3.8

172

19

 229.00

231.00

2.00

3.2

188

49

 231.00

233.00

2.00

3.6

442

73

 233.00

235.00

2.00

3.8

253

45

 235.00

237.00

2.00

3.8

156

53

 237.00

239.00

2.00

3.2

152

101

 239.00

241.00

2.00

2.7

60

40

 241.00

243.00

2.00

2.3

57

52

 243.00

245.00

2.00

3.0

48

58

 245.00

247.00

2.00

3.2

60

45

 247.00

248.00

1.00

6.4

195

18

 248.00

249.00

1.00

5.6

233

117

 249.00

251.00

2.00

4.9

83

36

 251.00

253.00

2.00

2.7

54

36

 253.00

255.00

2.00

2.7

62

47

 

Drill Hole

V-04

Azimuth:

145º

Dip

-70º

 Collar Coordinates:

Northing

2,949,653 m

Easting

402,064 m

 From
m

To
M

Interval
m

Silver
gm/tonne

Lead
ppm

Zinc
ppm

 125.50

126.25

0.75

6.9

2,960

29,300

 167.00

169.00

2.00

2.1

46

190

 

Drill Hole

V-06

Azimuth:

145º

Dip

-70º

 Collar Coordinates:

Northing

2,948,926 m

Easting

401,074 m

 From
m

To
M

Interval
m

Silver
gm/tonne

Lead
ppm

Zinc
ppm

 50.00

52.00

2.00

23.8

13,400

30

 68.00

70.00

2.00

9.0

13,500

196

 70.00

72.00

2.00

2.1

119

324

 86.00

88.00

2.00

2.9

267

80

 88.00

90.00

2.00

2.8

355

89

 100.00

102.00

2.00

2.3

80

248

 

Drill Hole

V-06

Azimuth:

145º

Dip

-55º

 Collar Coordinates:

Northing

2,948,926 m

Easting

401,074 m

 From
m

To
M

Interval
m

Silver
gm/tonne

Lead
ppm

Zinc
ppm

 172.60

173.50

0.90

141.0

122,500

17,900

 175.60

176.50

0.90

65.3

50,200

27,200

 176.50

177.55

1.05

16.3

30,300

8,560

 186.40

187.80

1.40

2.9

886

343

 187.80

189.00

1.20

7.9

3,910

9,830

 189.00

190.20

1.20

2.2

360

311

 191.50

193.30

1.80

3.0

529

4,470

 193.30

195.20

1.90

2.2

392

109

 195.20

196.20

1.00

2.9

251

66

 207.00

209.00

2.00

4.8

297

170

 211.00

212.50

1.50

2.1

67

237

 

Drill Hole

V-12

Azimuth:

145º

Dip

-50º

 Collar Coordinates:

Northing

2,948,145 m

Easting

399,980 m

 From
m

To
M

Interval
m

Silver
gm/tonne

Lead
ppm

Zinc
ppm

 38.70

39.70

1.00

24

714

42

 83.95

86.00

2.05

3.0

111

774

 106.00

108.00

2.00

2.3

389

125

 146.50

147.80

1.30

374.0

123,500

74

 147.80

149.80

2.00

6.1

1,480

41

 149.80

151.80

2.00

4.3

577

103

 151.80

153.80

2.00

2.6

726

31

 

Drill Hole

V-13

Azimuth:

145º

Dip

-50º

 Collar Coordinates:

Northing

2,949,803 m

Easting

402,209 m

 From
m

To
M

Interval
m

Silver
gm/tonne

Lead
ppm

Zinc
ppm

 157.60

159.90

2.30

8.9

1,025

58,500

 159.90

162.25

2.35

6.3

1,165

342

 162.25

164.05

2.20

5.3

229

482




Discussion of partial results:
The phase 1 drill program completed by Mexican Silver at Vallecillo was the first ever drilling directed at this district. As the majority of the underground workings are inaccessible, and historic mine maps from the various mines in the district were not available, this drill program provided the first modern subsurface data regarding in situ mineralization. Mexican Silver was cautious in its drilling pattern due to the lack of historic mine maps as it did not want the drill to encounter underground open areas which would result in the loss of the hole and potential damage to the drilling equipment. The subsurface information obtained through this phase of drilling will allow phase 2 drilling to step closer to the historic mining targets.  Mexican Silver believes because of this it has not yet drilled through the main vein or mantos but is drilling the conduits of the fluids bringing the mineralization.

In this context, the assay results of the nine drill holes received to date are very favorable, with all holes other than hole V-05, having intersected mineralization. In particular the total widths of intersections with analyses of greater than 1 gm Ag/ tonne are impressive: Hole V-01 intersected a sequence of 70.0 meters with values equal to or greater than 1 gm/tonne Ag,  and likewise holes V-02 intersected  44.1 meters of  > 1 gm/tonne Ag,  hole V-03  intersected  81.5 meters of > 1 gm/tonne Ag, V-04 intersected  43.25 m of  > 1 gm/tonne Ag, hole V-06 intersected 54.5 meters of > 1 gm/tonne Ag,  (V-07, V-08, V-09, V-10 results still pending) ,V-11: intersected 36.06 meters of > 1 gm/tonne Ag, V-12: intersected  13.35 meters of > 1 gm/tonne Ag and V-13 intersected  6.85 m of  > 1 gm/tonne Ag.  While a final robust statistical analysis will be undertaken following receipt of the assay results for holes V-07, V-08, V-09, V-10, an initial interpretation of the assay results received to date indicate the presence of a strong mineralizing system. Three-dimensional rendering of the data obtained from the 13 hole phase 1 drill program is anticipated to allow Mexican Silver to model the geometry of this system and identify drilling programs needed to further delineate this system, perhaps on a district scale. 

Holes V-03, V-11 and V-13 have intersected and partially delineated (at 50 meter centers), a new mineralized manto located 250 meters west of the Dolores shaft.  Near the Santa Maria mine hole V-06 intersected 2 meters of 1.34% lead and 23.4 gm of Ag/tonne and then 16 meter further down the hole 2 meter of 1.34% Pb and 23.5 gm of Ag/tonne. Hole V-07 intersected similar veins and mantos nearby V-06. Analytical results for V-07 are pending.

In addition to the drilling program, surface mapping and sampling also made significant progress at Vallecillo. West of the Santa Maria mine, surface mapping has located the trace of a vein with widths of 0.4 to 0.7 meters that continues 1 kilometer to the west to the Magnolia mine where multiple veins were mapped in an area of 300 by 600 meters. Hole V-12, located near the Magnolia mine, intersected a vein with a width of 1.3 meters which assayed at 374 gm/tonne silver and 12.35% lead. The multiple veins sampled on surface near the Magnolia mine averaged 0.2 to 0.8 meters in width with assay results ranging from 10 to 100 gm/tonne silver and 0.5% to 5.0% lead.  Additional information regarding this surface mapping and sampling program is anticipated to be announced soon. 

Although assay results from four drill holes of the phase 1 drill program remain pending, the current results have already identified in drilling and surface mapping / sampling, a zone of mineralization along 3.5 km of strike. This zone is open along strike in both directions and to depth. Assay results from the remaining four holes of the phase 1 drill program at Vallecillo are expected to be received shortly.

Mexican Silver also announces that significant progress has been made in exploration of its properties located in the Mamulique and Iguana districts.  Additional information regarding these exploration activities is anticipated to be announced soon.

Mexican Silver has $11 million in cash and will be initiating a substantial exploration program in 2008.

All drill core samples were shipped to ALS Chemex Laboratory ("Chemex") for analyses. Chemex has an International Standard Organization rating of ISO 9001:2000 and is independent of Mexican Silver. The split drill core sample was crushed and a sub-sample (aliquot) split off, pulverized and screened through a 150 mesh screen. Analyses were preformed using standard acid digestion and spectrographic techniques.

Mexican Silver follows a rigorous Quality Assurance/Quality Control program consisting of inserting standards and duplicates into the sample stream submitted to Chemex for analyses.

Mr. William Dynes, P. Geol., the project supervisor of Mexican Silver's drilling program on the Vallecillo Property, is the Corporation's nominated Qualified Person responsible for monitoring the supervision and quality control of the programs completed within the its properties. Mr. Dynes has reviewed and verified the technical information contained in this news release.

This news release contains forward-looking information including but not limited to comments regarding the timing and content of upcoming work programs, geological interpretations and potential mineral recovery processes. Forward-looking information includes disclosure regarding possible future events, conditions or results of operations that is based on assumptions about future economic conditions and courses of action, and therefore, involves inherent risks and uncertainties. When used in this news release. The words "estimated", "plan", "anticipated", "expected", "intend", believe", and similar expressions are intended to identify forward-looking statements. These statements involve known and unknown risks, uncertainties and other factors that may cause the actual results, performance or achievements of Mexican Silver to be materially different from any future results, performance or achievement expressed or implied by such forward-looking statements. For any forward-looking information given, management has assumed that the analytical results it has received are reliable, and has applied geological interpretation methodologies which are consistent with industry standards. Although management has a reasonable basis for the conclusions drawn, there can be no assurance that forward-looking statements will prove to be accurate and actual results may differ materially from those currently anticipated in such statements. For such statements, we claim safe harbour.

About Mexican Silver Mines
Mexican Silver Mines is a silver focused junior resource company developing three former silver producing properties in north-eastern Mexico. To learn more about Mexican Silver Mines, please visit: www.mexicansilvermines.com.

 

ON BEHALF OF THE BOARD OF
MEXICAN SILVER MINES LTD.

Feisal Somji, B.Sc., MBA
President and Chief Executive Officer

FOR FURTHER INFORMATION, CONTACT:

Mexican Silver Mines Ltd.
Feisal Somji, President& CEO
Phone:  403.236.5089
Fax:      403.398.0693
Email: fsomji@mexicansilvermines.com
Web:  www.mexicansilvermines.com

Investor Relations
Jamie Mathers, Ascenta Capital Partners Inc.
Phone: 604.684.4743 ext.236
Phone: 866.684.4209
Email:jamie@ascentacapital.com


The TSX Venture Exchange has not reviewed and does not accept responsibility for the adequacy and accuracy of this information.

 

This email was sent by: Ascenta Capital Partners Inc.
Suite 1610, 1066 West Hastings Street, Vancouver, BC, V6E 3X1 Canada
www.ascentacapital.com

 

Rio Alto Mining Limited

DEVELOPMENT STAGE
CODE : RIO.TO
ISIN : CA76689T1049
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Rio Alto is a copper and gold development stage company based in Canada.

Rio Alto develops copper, gold and silver in Peru, and holds various exploration projects in Mexico.

Its main asset in development is LA ARENA in Peru and its main exploration properties are ANILLO DE FUEGO, PROVIDENCIA, RAL ( LA IGUANA ), VALLECILLO, MAMULIQUE and LA BLANCA in Mexico.

Rio Alto is listed in Canada. Its market capitalisation is CA$ 793.2 millions as of today (US$ 798.5 millions, € 597.1 millions).

Its stock quote reached its lowest recent point on December 26, 2008 at CA$ 0.07, and its highest recent level on February 23, 2012 at CA$ 4.54.

Rio Alto has 175 886 000 shares outstanding.

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4/23/2008 Grants and Re-Prices Options
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