The Dullstroom Platinum (Pty.) Ltd. tenement area, comprising of more than 2500 hectares is located on the eastern edge of the Bushveld Igneous Complex (BIC), in the vicinity of the hamlet of Tonteldoos some 20 kilometers north of Dullstroom, Mpumalanga Province, South Africa

Locality map for the Dullstroom Platinum Project.
Mafic rocks of the BIC are represented in green; Transvaal

Supergroup in yellow; Bushveld granites and Rooiberg Felsites in red.
Source: Jubilee Platinum plc (Map not to scale)

The two major PGM bearing reefs within the BIC, the Merensky and UG2, outcrop to the north of the tenement area, and host Anglo Platinum’s De Brochen Mine and Aquarius’ Everest South Project only 21km north of the area of interest. The Merensky and UG2 reefs have been mapped on the farm Kliprivier 73JT, some 7 kilometers to the NNE of the tenement block, before being obscured to the south by Transvaal Supergroup cover i.e. the roof /hangingwall to the BIC intrusive. An anomalous regional gravity high strongly suggests that the BIC extends below the Transvaal Supergroup cover in the area, and is further postulated to extend southwards below Transvaal and Karoo sediment cover towards the direction of Bethel.

In October 2004 the Company drilled its first stratigraphic borehole on portion 800JS of the farm Mapochsgronde 500JS

The Borehole DP001 was collared on the farm Mapochsgronde 500JS approximately 2km north of the village/hamlet of Tonteldoos and drilled to a final depth of 733.9 metres.

The lithologies intersected are outlined below (click for a more detailed summary report and diagrammatic log of the borehole)

From collar to a depth of 586.82 metres a massive, medium to coarse-grained gabbronorite, with local development of leuco and mela gabbronorite dominates. The lithologies are characteristic of the Main Zone of the Bushveld Complex.

Three distinct zones or “packages” of anorthosite were encountered: i) from 70.26 and 85.00 metres: intercalated with gabbronorite, (distinctly spotted appearance); ii) between 282.80 and 295.21 metres (not as well developed); and iii) between 419.14 and 419.84 metres as a narrow anorthosite package.

Between 461.50 and 552.94 metres, a fine grained igneous intrusive was intersected.

Between 554.61 and 561.82metres, the “Tennis Ball Marker” (TBM) was encountered metres, a distinctive horizon encountered during surface mapping. Below the TBM the gabbronorite was generally of a fine to medium grain size, with the exception of narrow pegmatoidal bands

Between 586.82 metres and 716.42 metres a number of thick fine grained intrusives, were encountered, which are probably Bushveld sills and form part of the Marginal Zone of the complex.

From 716.42 to 726.80 metres, laminated and hornfelsed volcaniclastic or pyroclastic rock of the Dullstroom Formation and quartzite of the Steenkampsberg Formation were intersected. At final depth of 733.39 metres Transvaal Supergroup sediments and volcanic rocks of the footwall sequence were encountered.

Sr-isotope analysis on selected samples taken from the drill core (carried out by Prof. Johan Kruger (University of the Witwatersrand), strongly suggested a Lower Main Zone stratigraphic position but close to the Critical Zone and Main Zone boundary.

Following a review of the above data, the Company proposes to drill a further diamond borehole between 1 and 2 kilometres NNW of DP001 to intersect UG2 and possible Merensky Reefs at a depth shallower than 1000 metres.

View South East Across Houtenbek

Source: Jubilee Platinum plc