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Chenchu Property

ChenchuMtn_22042008-sm.jpg

Location and Background

The Chenchu Prospecting License was held by Santa Fe Mining Inc. under license issued on 27 November 1996. Birim (now Volta) acquired the property by a Property Transfer Agreement signed on 4 June 1997.

The Chenchu Prospecting License is located in west central Ghana within the Brong Ahafo Region, between latitudes 7o55'N and 8o05'N and longitudes 2o10'W and approximately 2o20'W. It is located 20 km due north of Voltas regional field camp on the Bui Belt.

Geology and Mineralisation

The Chenchu Trend is a major northeast-oriented structural corridor extending across the whole of the strike length of the Bui Belt area from the southwest near Japekrom through Seikwa, Chenchu Mountain and Tombe to the Volta River in the north.

The Chenchu Property comprises of a thick and fairly homogeneous sequence of phyllites, schists, metagreywackes and, locally, metavolcaniclastics. The property is regularly crosscut by younger dolerite dykes which may have emplaced at block fault boundaries.

Typically mineralisation, as on the Ashanti, Asankrangwa, and Sefwi trends of Ghana, occurs in northeast-trending structures hosting quartz lodes and associated disseminated sulphide in altered and deformed wallrocks.

Exploration Strategy

Volta's strategy on the Chenchu Property aims to bring the Tombe Prospect to account by unlocking the geometrical relationships of the mineralised quartz lodes.

To date the following phases of activity have been achieved:

To date the following phases of activity have been achieved:

Stream sediment sampling.
Soil net (300m x 300m) and a multiple of follow-up soil grids (200m/400m x 25m/50m) sampling defined a 4km-long gold-in-soil anomaly.
Multi-element geochemistry (neutron activation) enabled an assessment of the geochemical zoning on the Tombe-Parabu trend.
Trenches have been dug for cross-strike geological information at various localities.
A number of phases of core and RC drilling totaling 429 holes have investigated the full strike of the Tombe Prospect to a nominal drill fence spacing of 200m and to an average depth of less than 40 metres.
Induced Polarisation (I.P.; 3 sq. km) and pole dipole geophysical surveys have been completed to elucidate the internal structure of the Tombe Prospect.

Tombe Target Area

Location

The Tombe Prospect is situated in the centre of the Chenchu Property and is aligned with the through-going northeast-oriented Tombe-Parabu shear zone. The gold-anomalous geochemical signature of this zone has been traced for over 40 kilometers along the shear zone.

Geology and Mineralization

The Tombe Prospect comprises of a thick stratigraphic sequence of highly sheared argillites, wackes and volcaniclastics which have been intruded by foliation-parallel felsic dykes and crosscutting dolerite dykes. Mineralization is generally associated with quartz lodes and/or sulphide (pyrite) in sites of high tectonisation within the soft sequence of lithologies. Albite, hematite, carbonate and silica alteration is intense in the mineralised zones. Mineralization is focused by competency contrasts in the structural corridors which provided the brittle-ductile regime conducive to the deposition of gold. Jogs, kinks and arcuations in the northeast-trending mineralized structures are evident at the belt-scale and also play a role in focussing mineralisation at the prospect scale. Structural observations suggest a late transpressive deformational event focused on pre-existing regional structures, including early thrust and wrench features. In detail, structural fabrics such as late crenulation cleavage development and associated kink and crenulation folds, intersection lineations, rodding and boudinage support these observations. It is expected that any future definition of the geometry of payshoots will correspond to these structural orientations and as such the structural mapping of such a prospect is very important to facilitate an understanding of the mineralisation and to enable subsequent resource modelling.

Exploration Strategy

The Tombe Prospect exhibits all the characteristics of being associated with a very significant mineralizing system. Drilling on the Central anomaly returned an average grade of approximately 0.4g/t over 300 meters, including intersections of 3.2m @ 15.6 g/t, 4m @ 4.5 g/t and 4m @ 6.3 g/t. Subsequent drilling at the Tombe North area returned intersections of up to 17m @ 4.47g/t and 17m @ 9.67g/t, which potentially represent plunging higher grade shoots. The geometry and extent of these higher-grade shoots will be the focus of future search on the license.

Drilling to date has highlighted numerous significant intercepts. The table below highlights the intercepts with grade-widths greater than 10 meter grams.

HOLE	UTM30N_E	UTM30N_N	RL	From (m)	To (m)	Intercept	Grade widths
CTR042	9240	26300	152.485	6	8	2m @ 5 g/t	10.00
CTR294	588184.3	890242.9	168.23	36	47	11m @ 0.91 g/t	10.01
CTR021	9200	26100	169.878	12	20	8m @ 1.27 g/t	10.16
CTR101	587986.2	889876.8	183.653	27	31	4m @ 2.54 g/t	10.16
CTR225	587725.9	889574.3	175	43	53	10m @ 1.02 g/t	10.20
CTR277	588391.8	890472.8	181.347	12	30	18m @ 0.57 g/t	10.26
CTR044	9200	26300	151.931	2	18	16m @ 0.65 g/t	10.40
CTR221	587892.6	889698.4	175	47	60	13m @ 0.8 g/t	10.40
CTR059	9250	25900	176.79	10	16	6m @ 1.74 g/t	10.44
CTR067	9310	26300	153.472	44	46	2m @ 5.29 g/t	10.58
CTR201	587889.6	889970.4	175	51	54	3m @ 3.57 g/t	10.71
CTR346	586776.1	888687.8	203.347	41	46	5m @ 2.18 g/t	10.90
CTR137	587880.7	889420.1	175	28	33	5m @ 2.19 g/t	10.95
CTR053	9490	25900	179.584	0	14	14m @ 0.84 g/t	11.76
CTR140	587796	889504.7	175	19	24	5m @ 2.38 g/t	11.90
CTR208	588751.9	890808.7	184.125	43	46	3m @ 4.02 g/t	12.06
CTR078	9480	26000	167.834	14	20	6m @ 2.19 g/t	13.14
CTR004	9440	25900	180.619	24	38	14m @ 0.94 g/t	13.16
CTR077	9500	26000	168.853	38	48	10m @ 1.32 g/t	13.20
CTR260	588670.6	890611.3	185.254	5	14	9m @ 1.47 g/t	13.23
CTR283	588561.8	890303.6	192.152	42	53	11m @ 1.21 g/t	13.31
CTR186	588689	890802.9	188.413	71	73	2m @ 6.66 g/t	13.32
CTR101	587986.2	889876.8	183.653	43	48	5m @ 2.68 g/t	13.40
CTR027	9320	26100	158.708	22	34	12m @ 1.12 g/t	13.44
CTR296	588240.7	890186	171.973	14	36	22m @ 0.64 g/t	14.08
CTR040	9280	26300	153.009	22	34	12m @ 1.2 g/t	14.40
CTR008	9360	25900	171.334	26	40	14m @ 1.04 g/t	14.56
CTR233	588711.8	890990.8	183.21	45	63	18m @ 0.87 g/t	15.66
CTR243	588839	890721.9	193.064	49	51	2m @ 8.21 g/t	16.42
CTR069	9520	25800	186.497	44	50	6m @ 2.8 g/t	16.80
CTR052	9470	25900	181.422	10	18	8m @ 2.13 g/t	17.04
CTR297	588269	890158	172.342	25	28	3m @ 5.69 g/t	17.07
CTR074	9420	25800	177.694	46	50	4m @ 4.5 g/t	18.00
CTR086	587875.5	889706.9	192.415	11	14	3m @ 6.07 g/t	18.21
CTR027	9320	26100	158.708	10	14	4m @ 5.04 g/t	20.16
CTR206	588089.5	889778.4	175	53	75	22m @ 0.96 g/t	21.12
CTR061	9250	26100	166.342	26	48	22m @ 0.97 g/t	21.34
CTR220	587864.2	889717.6	175	7	23	16m @ 1.46 g/t	23.36
CTR055	9530	25900	174.376	26	30	4m @ 6.33 g/t	25.32
CTR015	9220	25900	180.201	8	40	32m @ 0.8 g/t	25.60
CTR203	588004.2	889858.4	175	57	66	9m @ 3.53 g/t	31.77
CTR127	588683	890737.8	188.751	47	58	11m @ 2.9 g/t	31.90
CTR002	9480	25900	180.868	0	38	38m @ 1.08 g/t	41.04
CTR155	587119.7	888770.5	175	35	37	2m @ 21.48 g/t	42.96
CTR275	588334	890528.6	182.042	0	12	12m @ 3.98 g/t	47.76
CTR014	9240	25900	178.264	20	26	6m @ 11.29 g/t	67.74
CTR127	588683	890737.8	188.751	22	39	17m @ 4.47 g/t	75.99
CTR186	588689	890802.9	188.413	36	42	6m @ 18.38 g/t	110.28
CTR191	588645.8	890703.6	187.59	27	54	27m @ 6.37 g/t	171.99

Next Steps

Strategic future activities will involve the following:

Structural mapping of the Tombe Prospect, especially in the vicinity of the "Central" and "Tombe North" Zones. This information will provide 3D visualisation of existing drill intercepts and their extrapolation to surface and down plunge.
Trenching to investigate 'daylighting' mineralised shoots.
Oriented RC and core drilling to intersect mineralised shoots down plunge.
Resource estimation.

For more information, send questions and comments to
This page was created on Wed Sep 8, 2010 at 11:01:20 AM Pacific Time.