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Foremore VMS-Gold Project: Initial Diamond Drilling Program Begins

 News Release #12-04

Vancouver, British Columbia, August 3, 2004: Roca Mines Inc. ("Roca" or the "Company") announces the start of a diamond drill program at its 208 (80 sq.mi) FOREMORE Project located approximately 45 km north of Barrick Gold's Eskay Creek Mine in northwestern British Columbia.

Roca has commenced an initial drill program at FOREMORE consisting of 6,000 metres (19,685 ft) of diamond drilling at primary target areas discovered by the Company in 2003 and 2002, and at new outcrops discovered in spring/summer 2004. These primary drill targets include:

  1. The North Zone is a 3 km (1.9 mi) long horizon along which the BRT Prospect, a precious metal-enriched volcanogenic massive sulphide ("VMS") target, was located during exploration in 2003. The BRT Prospect will be drilled first; however, it represents only one of two known massive sulphide outcrops along a significant strike length of prospective rocks at the North Zone. As a reference, the BRT lies at the northeast end of the North Boulder Field (NBF), a 2 km (1.2 mi) long discontinuous zone of mineralized boulders located at the base of the North Zone slope. As reported in July 2003, chip sampling over the 2.95 m (9.67 ft) BRT outcrop resulted in assays of 10.24% zinc, 8.58% lead, 0.27% copper, 186.6g/t silver and 2.04g/t gold. These assay results, and the textures observed in the showing, are directly comparable to many of the mineralized boulders found in the North Boulder Field (NBF). Cominco reported average assays of 10.2% zinc, 3.5% lead, 87 g/t silver and 1.1 g/t gold from layered massive sulphide boulders in the NBF in 1989. Drilling in 2003 at the BRT showed the massive sulphide VMS mineralization to be hosted within a thick mineralized pyritic quartz sericite phyllite (metamorphosed volcanic rock) observed to be from 11 m (36 ft) to 30 m (98 ft) in thickness.

    Prospecting along the North Zone in July 2004 located the newly discovered Digger showing, a similar pyritic phyllite horizon in outcrop and located approximately 100 m (328 ft) northeast of BRT. More recently, the newly discovered Ryder showing, located 1.6 km (1 mi) along strike to the northeast from the BRT was also discovered. The Digger showing is over 9m thick and results from chip sampling across the unit returned a 1m assay of 3.56 g/t gold and 4.0 g/t silver within an interval of 9m at 0.77 g/t gold and 9.0 g/t silver. Similar to the host pyritic quartz sericite phyllite drilled in 2003, base metal values are anomalous but generally less than 0.5% combined lead and zinc. The Ryder showing is similar in appearance and style of massive sulphide mineralization outcropping at the BRT showing, and sampling is now in progress.

  2. The SG Zone, discovered by the Company in 2002 presents another precious metal enriched VMS target located approximately 3.5 km (2.2 mi) south of the BRT. Warm weather conditions observed during the past two exploration seasons have resulted in unprecedented snow melt at the SG Zone yielding much greater outcrop exposure than in previous years. Mapping in 2003 resulted in the identification of an extensive felsic dome complex, which presents a sizeable VMS target that is currently open down dip and along strike. Roca is particularly interested in an area approximately 1 km (0.6 mi) to the north east of the SG Zone discovery showing where mapping indicates a favorable sedimentary environment for potential VMS accumulation. Roca conducted a 20-line km Max-Min Electromagnetic survey in 2003 that confirmed a geophysical conductor previously identified by Cominco in the area and along the newly discovered contact horizon. The Company's SG Zone work to date provides a compelling and large-scale VMS exploration target area.
Roca crews continue to prospect the greater property area and early 2004 work has resulted in new significant mineralized showings on the property, including the Digger and Ryder that have expanded the prospectivity of the North Zone to over 3km of strike. Other significant exploration results to date include the discovery of a quartz carbonate boulder at the silver-rich Wishbone area, which contained 2,049 g/t silver, 5.03% copper, and 0.48 g/t gold. New outcrop and mineralized boulders have also been mapped in the Hanging Valley and the new Horizon showing, approximately 6 km (3.7 mi) south of the SG Zone, comprises several outcrops of massive magnetite and lesser chalcopyrite. Samples of the Horizon showing have been submitted for assay and results are expected shortly.

All aspects of the Phase 1 exploration program at FOREMORE are under the supervision of W.A. (Sandy) Sears, P.Geo., a qualified person as defined by National Instrument 43-101.

"Scott Broughton"

Scott E. Broughton, P.Eng - President and CEO

For further information contact Scott Broughton, John Mirko or David Skerlec at:
Tel: 604-684-5900 (Broughton Ext. 114 / Mirko Ext. 110 / Skerlec Ext. 147)
Email: [email protected] / [email protected] / [email protected]

The TSX Venture Exchange does not accept responsibility for the adequacy or accuracy of this release.

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