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Cluster Property



Location and Background

The Cluster Property is located 30km north of Wenchi in the Brong Ahafo region of Ghana. Cluster is a successor Prospecting License from the regional Bui Reconnaissance License. Its name derives from its multiple gold-anomalous prospects (namely Awisa, Chert Ridge, Brumo, Kwakasiem and Muramurra Prospects).

Geology and Mineralisation

The Property is situated in a Lower Birimian sequence of isoclinally-folded phyllites, wackes and volcaniclastics, with the occasional volcanic unit. Structural corridors exhibiting multiple reactivation and alteration have exploited the collective rheological contrasts between lithological sequences. These corridors have undergone intense silicification which now manifest as extensive, elongated "chert"-like lenses with noticeable and associated positive relief. The crustal-scale corridors have channelled and focused auriferous fluids and as they are zones of crustal weakness they have been exploited by felsic intrusives.

All mineralisation is structurally controlled and is associated with intense silica and carbonate alteration and associated sulphide (pyrite and arsenopyrite).

Exploration Strategy

The aim is to develop the Chert Ridge drill prospect and the other anomalous areas into measured resources. Work achieved to date has included:
Chert Ridge Target

Location and Background

The Chert Ridge Prospect is located in a narrow extension of the northern boundary of the Cluster Property. This area is located 40km north of Wenchi and just west of the main Wenchi-Bole road to northern Ghana.

Santa Fé Inc. defined this target using soil sampling, trenching and 6 RC holes in 1996. Only one of the holes intercepted the zone and produced 6m @ 2.2g/t Au. Volta has progressively refined and developed the understanding of this zone which has distinct potential to develop into a considerable resource at a centralised position amidst numerous other encouraging anomalous zones (Mo West Prospect 4km; Tombe Prospect 6km; Kwakasiem 7km; Brumo 7km; Chenchu Mountain 20km away).

Geology and Mineralization

The contact between a sequence of phyllites and volcaniclastics (with volcanics) has provided sufficient rheological contrast to focus a zone of shearing and reactivation. This zone exhibits strong silica and carbonate alteration and has accommodated at least one phase of felsic intrusion. The I.P. data reveals a number of chargeable and resistive axes that trend oblique to, and intersect with the Chert Ridge Main Zone. These zones of structural intersection are likely to represent additional controls on mineralisation, as seen at Zone "A" and "B".

The mineralization appears to be fully contained within intensely carbonate-altered felsic intrusive lithologies and can extend into the "chert"-like units on the contact margins of the intrusives. Coarse euhedral and fine pyrite and arsenopyrite are present in the mineralized zones. 3D modeling of the drill intercepts has revealed the likelihood of high-grade sub-horizontal plunging shoots.

Exploration Strategy

An open-ended and continuous gold-mineralized structure exceeding 2,200 meters in strike has been defined by drilling to date. Two potentially economic shallow-plunging high-grade zones with a cumulative strike of 720m have been defined within this overall strike

Significant intercepts that define the various pods of mineralisation of the Chert Ridge Prospect (Zone A, B, C and D) are included in the table below.

Drill hole number Hole Depth (m) Interval (m) Width (m) Grade (Aug/t)
Zone A 220 meters
BCC004 115 39-49 10 2.23
BCC005 50 16-22 6 1.51
BCC006 54 32-44 12 3.09
BCC043 60 28-38 10 3.09
DKR002 110   6 2.13
BCC044 61 29-41 12 2.88
BCC065 123 92-116 14 2.63
BCC069 126 113-115 2 0.89
BCC072 186.5 163-165 2 1.22
Zone B 500 meters
BCC016 50 34-46 12 1.32
BCC017 50 5-21 16 0.50
BCC018 54 47-52 5 2.14
BCC020 50 5-15 10 4.79
BCC021 54 45-46 1 2.06
BCC022 54 14-21 7 0.73
BCC047 including 80 26-39 37 13 1 6.84 77.56
BCC070 120 70-77 7 1.01
BCC071 123 88-89 1 2.08
Target C
TKR2000 trench   3 1.68
BCC067 84 34-38 4 0.91
BCC068 50 14-18 4 0.94
Target D
TKR4150 trench   6 1.29
BCC063 60 5-6 1 0.55

Next Steps
The objective now is to extend the mineralized structure within the 16km-long portion of the Chert Ridge geophysical trend that is under license and to follow the shoots down plunge and to identify additional high-grade zones of mineralisation. This work will likely be achieved by detailed 3D modeling and regular drill testing of likely mineralized geometries until a larger grid-style resource drill-out is warranted.

To this end, a phase of aircore drilling (343 shallow holes) was completed by March 2008 and results are awaited. Visual predictions from the aircore chips are that the zone has been occasionally intersected. Structural mapping is currently underway to improve the understanding of the structural controls to mineralization. It is expected this will impact the drill positioning of the next phase of RC drilling which will test the down-plunge extensions of the high-grade shoots.

Soil geochemical re-sampling over the northern extent of the Chert Ridge zone is underway to better define the mineralised zone.
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This page was created on Wed Sep 8, 2010 at 10:49:21 AM Pacific Time.