Projects - Brazil
Tanque Fundo Project
|
Licence |
Type |
Grant Date |
Holder |
Interest Earning or Held |
Exercise Fee |
Royalty |
Future Payments |
| 866855 |
EL |
23/04/2007 |
CMGM |
100% |
N/A |
2.0% |
N/A |
| 866239 |
EL |
26/04/2010 |
CMGM |
100% |
N/A |
N/A |
N/A |
| 867376 |
EL |
26/08/2009 |
CMGM |
100% |
N/A |
N/A |
N/A |
| 867377 |
EL |
23/06/2010 |
CMGM |
100% |
N/A |
N/A |
N/A |
The Project area covers 4,408Ha.
Tanque Fundo Project consists of four exploration licences and is located approximately 50km south-southwest of Cuiabá. The titles are strategically located over one of the major mineralised trends in the Cuiabá Basin, the Varzea Grande structure.
Sampling quartz veins previously extracted during garimpo activities
The tenements are located over a northeast trending ridge, the higher ground being a product of differential erosion due to induration by extensive and intensive quartz veining over the area of the ridge. The entire soil profile of the ridge has been removed for colluvial gold and more recent shallow bulldozing for metal detecting has been conducted over the area. A large dam on the southern edge of the tenement was used by garimpeiros to process the colluvium removed from the ridge and surrounding areas.
Surface mining has resulted in the exposure of an extensive quartz vein system exhibiting the two major northeast and northwest vein trends. Within the tenement, the vein system is approximately 2.5km long and 200m wide. Individual veins are up to 1.5m wide and are composed of opaque white quartz with varying degrees of ferruginisation. The host lithologies are predominantly northwest-trending pelites and medium to coarse sandstones.
Typical narrow vein garimpo mining of northwest trending quartz veins at Tanque Fundo. Strike of mineralised corridor is perpendicular to
photo
An initial soil geochemistry program was
completed over the area in October
– November 2007. The surface
sampling program aimed to test a range of sample mediums, not only the veins
and host rocks, but also various regolith products.
Results from surface sampling indicate significant mineralisation in both regolith products and in-situ vein material. While much of the saprolitic (upper leached saprolite) material shows variable degrees of leaching and probable depletion in Au, the quartz veins, their ferruginous selvedges and the ferruginous in-situ and transported materials display significant Au mineralisation with individual values ranging up to 9.47g/t Au. Importantly for this Project the vein sampling has shown that both the northeast and northwest trending vein sets are mineralised. This adds significant upside to the potential tonnage of any resource. Small vein mining activities have concentrated on the small (1-5cm wide) northwest trending veins. This is thought to have been as much for reasons of practicality as contained gold. The large quartz veins could not be easily mined, handled or processed, whereas the smaller friable veins were easily excavated and could be processed with minimal effort.
Gold mineralisation is coarse and poorly distributed within the veins, hence modern drilling methods may not be a suitable first pass exploration technique. Instead the preferred exploration method is to process a bulk sample (in excess of 200t) of the vein material. The processing would be through a local plant with control samples assayed, also for gold mineralisation, using modern assay methods.
Tanque Fundo Project, significant results from surface samples.