Drilling Report

RNS Number : 1360W

Berkeley Resources Limited

06 June 2008

 



6 June 2008

HIGHLY ENCOURAGING DRILL RESULTS EXTEND GAMBUTA MINERALISATION

RESOURCE ESTIMATE PENDING

The Directors of Berkeley Resources Limited (AIM: BKY.L) are pleased to advise more encouraging results from the current drilling programme at the Gambuta project in Cáceres Province, Spain. 

The ongoing program of reverse circulation and diamond drilling has continued to produce consistently positive results which have extended the strike length of the deposit to 1300m, with widths ranging from 250m in the south-east to 350m at the north-west limit of drilling. Strong mineralisation remains open to the north-west beneath Tertiary cover. 

Since the announcement of results from the first four diamond drill holes on 10 April 2008, 21 RC holes and an additional 6 diamond holes have been completed. In the total of 31 holes drilled to date, 26 (84%) have encountered mineralisation over depths ranging from surface to 94m, with most mineralisation within 50m of surface. These results provide comprehensive confirmation, and extension, of the historical roto-percussion program in which 21 of the 24 CISA holes intersected uranium mineralisation. Assay results are now available for an additional thirteen holes drilled by Berkeley and include:

Hole	INTERSECTION	FROM
GAM-003	3.0 metres @ 0.0281% U3O8	8.0m
	4.0 metres @ 0.0359% U3O8	12.0m
	3.2 metres @ 0.0540% U3O8	25.0m
	6.5 metres @ 0.0561% U3O8	29.5m
GAM-005	3.0 metres @ 0.0218% U3O8	7.5m
	22.2 metres @ 0.0541% U3O8	13.8m
GAM-006	7.0 metres @ 0.0648% U3O8	43.0m
	3.0 metres @ 0.0498% U3O8	66.0m
GAMR-011	3.0 metres @ 0.1045% U3O8	30.0m
	3.0 metres @ 0.0414% U3O8	64.0m
	2.0 metres @ 0.0686% U3O8	83.0m
GAMR-013	3.0 metres @ 0.2465% U3O8	27.0m
	5.0 metres @ 0.0408% U3O8	35.0m
	5.0 metres @ 0.0791% U3O8	45.0m
	3.0 metres @ 0.0263% U3O8	56.0m
GAM-017	19.0 metres @ 0.0495% U3O8	7.0m
	18.0 metres @ 0.0992% U3O8	33.0m
	4.0 metres @ 0.0494% U3O8	60.0m
GAMR-018	7.0 metres @ 0.0485% U3O8	7.0m

Results of the downhole probes for the remaining Berkeley holes suggest that assay results will yield similar grades and thicknesses for shallow and deeper mineralisation. 

Drilling to date has twinned a number of the historical roto-percussion holes; completed profiles through the historically defined mineralised zone; successfully tested beneath the previously undrilled Tertiary cover in the central section of the deposit: and extended it beneath Tertiary cover to the north-west. The complete set of available assay results are summarised in the table below.

The Gambuta mineralisation occurs in a 1300m by 250-350m wide north-westerly trending litho-structural zone adjacent to a protrusion in the granite batholith. Host rock lithologies and mineralisation are similar to those recorded at Berkeley's Retortillo project. Within this zone the most strongly mineralised areas occur within a 150m wide zone of steeply dipping shears and fractures to depths of about 100m. 

This structurally disrupted zone has been intruded by aplitic dykes that appear to result in some concentration of mineralisation into thin, higher-grade zones (+0.06% U3O8). In profiles that show intact Tertiary cover, the deeper primary mineralisation is overlain by a wider (up to ~350m) zone of secondary lower grade (~0.03% U3O8) mineralisation which extends up to within about 30m of surface. This secondary mineralisation is about 10m thick in the central section, but thins laterally to about 2-5m. 

In the sixteen Berkeley holes for which assays have been received, the average accumulated intersection (at a 200ppm cut-off) is 12.8m at 621ppm U3O8, with the top of mineralisation averaging 23m deep. The maximum depth of mineralisation is 94m.

Interpretation of the drilling results, recent geological mapping, and an airborne radiometric and magnetic survey, indicate potential for extensions of the mineralised structural zone to the north-west, parallel to the interpreted sub-surface granite contact. Superimposing topography onto the geological and geophysical interpretations of this slightly plunging mineralised zone suggests potential for mineralisation to extend about 1km to the north-west before it is likely to be truncated by incised topography. The granite contact reduces the potential for extensions to the south and east.

Although fire season regulations require cessation of drilling activity in early June, the consistency of Berkeley's results to date, together with remaining assays and the historical information, will generate sufficient data to enable calculation of an inferred resource estimate in the next quarter. This estimate will be followed by a new drilling campaign aimed at infill and testing the limits of the potential north-west extension. 

Enquiries -    Managing Director: Matt Syme        Tel:  [phone]

            RBC Capital Markets: Martin Eales    Tel: [phone]

TABLE 1. DRILL DETAILS and INTERSECTIONS (200ppm cut-off)

HOLE_ID	UTM_E (m)	UTM_N (m)	RL	Inclination	EOH	From	To	Interval	%U3O8
GAM-001	291,730	4,404,118	387	-60 to 000	103.0	0.0	8.0	8.0	0.0586
						10.0	11.0	1.0	0.0218
						19.0	20.0	1.0	0.0512
						34.0	35.5	1.5	0.0301
						37.5	38.5	1.0	0.0389
						45.0	46.0	1.0	0.0768
						55.0	56.0	1.0	0.0343
						58.5	59.5	1.0	0.0338
GAM-002	292,381	4,403,899	369	-60 to 000	85.0	0.0	12.5	12.5	0.0741
						21.5	22.5	1.0	0.0312
						24.0	25.0	1.0	0.0394
						28.0	32.0	4.0	0.0997
						34.5	35.5	1.0	0.0340
GAM-003	292,368	4,403,827	353	-80 to 000	36.0	8.0	11.0	3.0	0.0281
						12.0	16.0	4.0	0.0359
						20.5	22.5	2.0	0.0340
						23.3	24.2	1.0	0.0707
						25.0	28.2	3.2	0.0540
						29.5	36.0	6.5	0.0561
GAM-004	292,368	4,403,828	353	-70 to 180	61.7	11.5	12.3	0.8	0.0218
						14.5	21.5	7.0	0.0431
						22.5	23.5	1.0	0.0397
						24.5	25.5	1.0	0.0531
						27.0	29.2	2.2	0.0256
						34.0	35.0	1.0	0.0285
GAM-005	292,368	4,403,827	353	-80 to 000	36.0	7.5	10.5	3.0	0.0218
						13.8	36.0	22.2	0.0541
GAMR-006	292,368	4,404,014	397	-90	100.0	40.0	41.0	1.0	0.0239
						43.0	50.0	7.0	0.0648
						55.0	57.0	2.0	0.0301
						66.0	69.0	3.0	0.0498
						76.0	77.0	1.0	0.0232
						79.0	80.0	1.0	0.0235
						85.0	86.0	1.0	0.0229
						90.0	91.0	1.0	0.0635
GAMR-007	292,067	4,403,971	402	-90	82.0	28.0	29.0	1.0	0.0529
						31.0	33.0	2.0	0.0228
GAMR-008	292,315	4,404,012	404	-90	90.0	34.0	35.0	1.0	0.0348
						45.0	46.0	1.0	0.0241
						49.00	51.00	2.00	0.0307
						53.00	54.00	1.00	0.0441
						55.00	57.00	2.00	0.0393
GAM-009	292,176	4,404,007	397	-90	112.4	30.95	33.00	2.05	0.0339
						45.00	45.50	0.50	0.0255
						54.50	56.00	1.50	0.0495
						65.50	67.50	2.00	0.0431
						71.50	72.00	0.50	0.0515
						72.50	73.00	0.50	0.0219
						74.50	75.00	0.50	0.0538
						81.00	81.50	0.50	0.0661
						82.50	84.80	2.30	0.0242
GAMR-010	291,993	4,403,945	399	-90	81.0	25.00	27.00	2.00	0.0373
GAMR-011	291,624	4,404,299	416	-90	107.0	30.00	33.00	3.00	0.1045
						43.00	44.00	1.00	0.0257
						64.00	67.00	3.00	0.0414
						83.00	85.00	2.00	0.0686
GAMR-012	291,700	4,404,349	413	-90	110.0	49.00	51.00	2.00	0.0264
GAMR-013	291,550	4,404,250	416	-90	105.0	27.00	30.00	3.00	0.2465
						35.00	40.00	5.00	0.0408
						45.00	50.00	5.00	0.0791
						56.00	59.00	3.00	0.0263
						82.00	84.00	2.00	0.0511
						90.00	91.00	1.00	0.0269
						93.00	94.00	1.00	0.0332
GAMR-017	291,933	4,404,097	373	-90	80.0	7.00	26.00	19.00	0.0495
						29.00	30.00	1.00	0.0941
						33.00	51.00	18.00	0.0992
						60.00	64.00	4.00	0.0494
GAMR-018	292,069	4,404,163	369	-90	76.0	7.00	14.00	7.00	0.0485
						22.00	23.00	1.00	0.0235
GAMR-019	291,401	4,404,095	421	-90	99.0	36.00	38.00	2.00	0.0200

The Grid has a datum of UTM 30N ED50. 

 

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