Ghana Drilling Update

Glencar Mining PLC 26 July 2004 Glencar Mining plc ('Glencar' or the 'Company') Ghana Drilling Update Highlights Glencar is pleased to announce assay results from recent drilling on its Asheba concession in southwestern Ghana. At the Atinasi North prospect, ore grade mineralisation has been confirmed over significant widths with best mineralised intervals intersected including the following: • AKDL41 3 metres at 20.5g/t from 9-12m. • AKDL46 9 metres at 11.0g/t from 39- 48m. • ALDL53 12 metres at 12.1g/t from 42-54m. In addition, an extensive mineralised quartz-carbonate stockwork has been intersected in diamond core which, while persistently mineralised, has returned anomalous but to date mostly sub-economic gold grades. This phase of drilling at the Atinasi North prospect has encountered significant thicknesses of high-grade gold mineralisation. However, a considerable amount of geological and structural interpretation remains to be done to determine the commercial potential of this prospect. Drilling at Tanaya, 3 kilometres to the northeast of Atinasi North, did not encounter any significant, additional ore grade mineralisation. Ongoing work in the coming months, therefore, will be concentrated in the Atinasi area. Background The so-called Atinasi-Tanaya trend is a 1 km wide NE-SW trending zone in the southern part of the Asheba concession. The zone encompasses the colonial era Atinasi and Cheriaman mines in the southwest and central parts of the trend respectively and the Tanaya prospect some 3km to the northeast of Atinasi. At Atinasi North a number of north-south trending high-grade quartz structures were exploited by the miners with, some of the workings reaching considerable depth. Both the Atinasi North and Tanaya prospects have also seen significant levels of recent artisanal mining activity. The area is thickly vegetated and deeply oxidised and there is little or no outcrop. At Atinasi the mapping and sampling has revealed a series of sub-parallel mineralised quartz vein structures within an approximate north-south trending zone and a steep westerly dip. The veins are hosted by a highly altered chlorite schist of basaltic origin. A first pass shallow reverse circulation drilling programme of 1,200m was completed at the Atinasi North and Tanaya prospects in December 2003. That programme intersected significant gold mineralisation in a number of holes and confirmed the potential for economic levels of mineralisation at Atinasi. All holes in the first programme were shallow, with a maximum downhole depth of 39m. Best intersection was 3m at 23g/t in a hole which intersected an extension of one of the mined mineralised quartz vein structures. Equally significant was the presence of extensive low grade mineralisation indicating the potential for a larger tonnage deposit in the area. The recent drilling programme was a combined reverse circulation and diamond drilling programme to follow up on the results from the December drilling. May/June Drill Programme The drilling was completed during May/June 2004 and aimed at proving the continuity and extent of the mineralised structures at Atinasi North and Tanaya prospects. A breakdown of the drilling completed is outlined in Table 1 below. Drill plan drawings can be viewed on the company website at www.glencarmining.ie. Prospect Drilling Boreholes Metres Atinasi North RC 23 1,430 DD 7 629 Tanaya RC 7 490 DD 1 50 Table 1 Drilling Summary All holes at each prospect were inclined at 50 degrees from the horizontal. At Atinasi North all holes were drilled to a 090 degree azimuth. Most reverse circulation holes were drilled to 70m depth with selected holes continued by diamond coring to a maximum depth of 150 metres. Significant assay intervals, based on a 0.5g/t Au cut-off grade, are listed for Atinasi North and Tanaya respectively in Tables 2a and 2b below; Table 2a Atinasi North Intersections Hole Type Azimuth Dip From To Interval Grade m m M g/t Au 34 DD 088 -50 6 7 1 1.10 34 DD 088 -50 32 33 1 11.45 34 DD 088 -50 48 50 2 7.35 34 DD 088 -50 95 96 1 0.59 34 DD 088 -50 116 117 1 2.25 34 DD 088 -50 119 120 1 0.60 35 DD 090 -50 36 42 6 0.72 35 DD 090 -50 80 81 1 1.45 36 RC 090 -50 12 18 6 0.87 41 RC 300 -50 9 12 3 20.50 43 RC 120 -50 6 12 6 0.77 44 RC 090 -50 0 3 3 0.56 45 RC 090 -50 63 66 3 0.53 46 RC 090 -50 6 9 3 0.61 46 RC 090 -50 21 24 3 0.88 46 RC 090 -50 39 48 9 11.00 47 RC 090 -50 0 3 3 7.36 47 RC 090 -50 54 57 3 1.73 48 DD 090 -50 29 30 1 0.62 48 DD 090 -50 82 83 1 2.53 48 DD 090 -50 90 91 1 6.10 48 DD 090 -50 106 107 1 0.87 48 DD 090 -50 117 118 1 0.88 49 RC 090 -50 12 18 6 3.38 -50 52 DD 090 -50 121 122 1 2.28 52 DD 090 -50 124 126 2 2.53 52 DD 090 -50 138 139 1 0.69 53 RC 090 -50 42 54 12 12.08 53 DD 090 -50 86 87 1 3.60 55 RC 090 -50 30 33 3 0.55 55 DD 090 -50 92 93 1 12.40 55 DD 090 -50 124 125 1 0.53 57 RC 090 -50 0 3 3 0.68 57 DD 090 -50 63 66 3 0.74 57 DD 090 -50 76 78 2 1.35 63 RC 090 -50 30 33 3 2.02 Atinasi North The recent drilling confirmed the significant high grade mineralisation intersected in the December 2003 programme. However it also confirmed the difficulty in proving continuity of the mineralised structures within this previously mined area. Most of the higher grade intersections occur within the central part of the drilled area and represent intersections within the generally north south trending suite of veins partially mined here during the colonial era. Our geological interpretation is not completed but highlights of the programme include: • Confirmation of along strike continuity of the earlier (December 2003) AKDL20 and AKDL 25 intersections by new boreholes AKDL46, which intersected 9m @ 11g/t between 39m and 48m depth and AKDL 34 which intersected 2m @ 7.3g /t between 48m and 50m depth. • A high-grade intersection in AKDL 53 of 12m @12.1g/t between 42m and 54m depth within a low-grade envelope. • The impact of the old mine excavations and of more recent artisanal workings on intersected grades remains difficult to assess. Several zones of poor recovery were again intersected in the central part of the prospect. We are incorporating as much survey information as possible on the old workings into our evolving geological model • Interpretation to date suggests that the drilling is at right angles to the main mineralised structures and thus the intersections quoted above represent close to true mineralised widths. • A new potential high-grade zone, the Alabee Zone, some 200m northeast of the original drilled area where one intersection of 3m at 20.5g/t in AKDL41 was obtained between 9m and 12m depth in a reverse circulation hole. • The distance between the high-grade intersection in AKDL 41 and the southernmost high-grade intersection drilled thus far in AKDL 53 (12m at 12.1 g/t gold) is approximately 300 metres. In addition to the high-grade intersections, an extensive mineralised quartz-carbonate stockwork development within the host metabasaltic rocks, and associated with the high- grade quartz veins, has been recognised in the diamond drillcore. The stockwork was intersected in 5 of the 7 diamond cored holes at Atinasi but was mostly mineralised at sub-economic levels. Gold grades returned from samples within the stockwork were typically within the range of 0.1g/t to 0.4g/t. Our interpretation to date shows 2 parallel, approximately north-south trending, stockwork zones with a steep westerly dip. We regard the stockwork as a potential host for a larger tonnage orebody and believe that its accurate modelling is an important component in directing future drilling at the prospect. We are looking especially at the potential development of this style of stockwork within the dioritic and granitic bodies immediately to the north and the south of the drilled zone respectively. Four short inclined reverse circulation drillholes were drilled in a northwest-southeast fenceline across a new zone on the northeast fringe of the Atinasi North prospect. Drilling was extended into this new zone, called the Alabee Zone, based on anomalous soil geochemistry coincident with mapped auriferous quartz float. Highest intercept was 3m at 20.5g/t at 9-12m downhole in AKDL41, a 39m deep reverse circulation borehole inclined to the northwest at 50 degrees. While 21m of this hole intercepted anomalous gold levels, this high-grade intersection was the only ore grade intercept in the hole. Hole AKDL43 at the southeast end of the fenceline returned an average grade of 0.26g/ t over its entire 42m length but intersected no high-grade mineralisation. Table 2b Tanaya intersections Hole Hole Azimuth Dip From To Interval Grade No. Type m m m Au g/t 63 RC 310 050 30 33 3 2.02 Seven reverse circulation drillholes were drilled at Tanaya, one of which was deepened with a diamond core tail. The cursory shallow drilling programme here in December had intersected reasonably promising results with several short ore grade intersections from the six reverse circulation drillholes drilled to downhole depths of 39m each. For example AKDL 27 had returned an intersection of 9m @1.57g/t including 3m @ 4.18g/t. This borehole was drilled in the immediate vicinity of artisanal workings which exploited a southeasterly dipping quartz vein. The recent drilling was aimed at testing the continuity of the vein structure along strike and down-dip. Results were disappointing and no further drilling is planned at Tanaya in the near future. However, future work at Tanaya will depend on the results of our evaluation and interpretation of the Atinasi-Tanaya trend as a whole over the coming months. Summary The recent phase of drilling at Asheba has encountered significant thicknesses of high- grade gold mineralisation at Atinasi North. The newly recognised and extensively developed quartz-carbonate stockwork presents a target for a larger tonnage orebody. The successful completion of the current structural and lithological interpretation work on both the high-grade zone and the stockwork is necessary before we can move on to commence resource definition drilling at Atinasi. For further information, contact Mr. Hugh McCullough Chief Executive, Glencar Tel: +353 1 661 9974 26th July 2004. This information is provided by RNS The company news service from the London Stock Exchange
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