Roca - Positive initial drill results at Nuevo Milenio
ROK: TSX.V
VANCOUVER, March 1 /PRNewswire-FirstCall/ - Roca Mines Inc. (ROK: TSX-V) ("Roca" or "the Company") has received preliminary assay results from selected sample intervals of two drillholes completed on the Nuevo Milenio silver-gold project. The project is located near Tepic in the state of Nayarit, Mexico. Additional results are pending for both these drillholes and two other holes that have been completed.
Highlights:
- The initial program comprises five HQ-size diamond drillholes, all
of which were primarily designed to twin historic drillholes and
sampling by Cream Minerals Ltd. ("Cream") - assay results have been
received from selected sample intervals of the first two holes;
- Drillhole NM-10-01 intersected 11.98 metres (8.64 m estimated true
width ("ETW")) averaging 239.5 gm/mt Ag and 0.942 gm/mt Au,
including 4.98 metres (3.59 m ETW) grading of 434.0 gm/mt Ag and
1.585 gm/mt Au. This intersection successfully replicates the 12-
metre interval encountered in historic drillhole DDH-02-06, but
returned a 62% increase in silver grade and a 103% increase in gold
grade over the twinned interval;
- Drillhole NM-10-02 intersected 10.98 metres (7.80 m ETW) averaging
103.0 gm/mt Ag and 0.457 gm/mt Au, including 2.78 metres (2.00 m
ETW) grading 262.9 gm/mt Ag and 1.50 gm/mt Au. This is a narrower
intersection than encountered in its twin, drillhole DDH-07-32, and
the intervals are not directly comparable; and,
- The initial results successfully show that conventional HQ diamond
drilling can readily test the zones of interest at Nuevo Milenio -
core recovery averaged 93% or greater in the zones of interest
initially sampled, compared to historic recoveries that ranged from
20 to 80%.
Nuevo Milenio Project Setting
Nuevo Milenio is a low-sulphide epithermal camp that is hosted by a sequence of intermediate to felsic volcanic flows, tuffs and breccias within a large collapsed caldera setting. There are three principal northwest-trending vein systems on the property; Dos Hornos -Veta Tomas, Once Bocas and Chacuaco-Cafetal. Previous exploration drilling by Cream has tested the Dos Hornos and Veta Tomas system over a strike length of approximately 1,300 m and the Once Bocas system over a strike length of 350 m. Surface exploration indicated that the drilled systems are open to the northwest and southeast and down dip. Numerous other areas of interest on the property are yet to be explored.
Phase 1 Program
The first two holes of the 2010 program were drilled in the northern part of the Dos Hornos and Veta Tomas vein system. Both intersected low-sulphidation quartz-chalcedony stockwork, vein and breccia mineralization within moderately to intensely clay-altered and variably silicified intermediate volcanics. Mineralization consists of narrow white to pale grey quartz stringers, stockworks and discrete drusy quartz veins and/or vein breccias that locally exceed 2 metres in width.
Drillhole NM-10-01 is a twin of DDH-02-06 and tested the northern part of the Dos Hornos and Veta Tomas system. Drillhole NM-10-02 was intended to twin DDH-07-32 and was collared 225 metres to the southeast of drillhole NM-10-01. However, the intervals are dramatically different in thickness, possibly as a result of drillhole deviation, and are not directly comparable. The following tables compare and summarize previous sample intervals and assays with those from the 2010 program.
Table 1.Comparison of DDH-02-06 and NM-10-01 (Dos Hornos Segment 1)
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Drill Hole From (m) To (m) Interval (m) Au (gm/mt) Ag (gm/mt)
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DDH-02-06 108.50 120.50 12.00 0.465 147.8
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NM-10-01 108.03 120.01 11.98 0.942 239.5
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including 108.03 113.01 4.98 1.585 434.0
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Table 2. Summary of DDH-07-032 and NM-10-02 (Dos Hornos Segment 2)
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Drill Hole From (m) To (m) Interval (m) Au (gm/mt) Ag (gm/mt)
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DDH-07-32 86.00 103.80 17.80 0.734 84.4
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including 99.80 103.80 4.00 1.436 288.9
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NM-10-02 86.95 97.78 10.83 0.457 103.0
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including 2.78 1.499 262.9
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Two additional drillholes, NM-10-03 and NM-10-04, twins of DDH-20-06 and DDH-07-23 respectively, have been completed on the southern part of the Dos Hornos and Veta Tomas vein system, and are being logged and sampled. The four holes cover a total strike length of approximately 850 m.
Drilling of hole NM-10-05, a twin of hole DDH-06-03, is currently testing the central part of the Once Bocas zone where previous work identified a broad band of discrete quartz veining, sheeted quartz veinlets and stockwork mineralization enveloped by moderately to intensely clay-altered volcanic rocks.
All diamond drilling for the program has been carried out by Falcon Perforaciones Mexico, S.A. de C.V. All assaying is being conducted by ACME Analytical Laboratories of Vancouver, BC. Samples are analyzed for 36 elements using four-acid digestion ICP-ES as well as for gold and silver using fire assay fusion with ICP-ES finish. Over-limits for gold or silver will be re-assayed using a gravimetric finish.
Bob Lane, P.Geo is the 43-101 qualified person responsible for the supervision of the drilling and sampling program and the preparation of this news release.
ROCA MINES INC.
"Scott Broughton"
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Scott E. Broughton - President and CEO
The TSX Venture Exchange does not accept responsibility for the adequacy or accuracy of this release.
SOURCE Roca Mines Inc.
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