Annual Report on MLNs 657,659,682 & 683.

Abstract

The following report covers the area defined by MLN's 657, 659, 682 and 683 covering an area of 50 hectares. Located approximately 50km south of Pine Creek and Skms west of Mt. Todd, access can be readily gained off the Stuart Highway along 50km of unsealed roads. The topography is broadly low-lying to gently undulating, rising to small hills about the location of the AN's. Previous literature on the area (referred to as, the Yinberri Wolfram Field) includes a 1916 report to the Government by Grey and Winters. Further reports came from Jensen (1919) and Walpole et al (1968), both as small mentions included in a regional overview of mineralisation within the Pine Creek Geosyncline. Recent active exploration reports seem restricted only to the Auridiam Consolidated Report, November (1988). which touches on the field however, it is primarily concerned with the EL's 4963 and 5124 immediately to the west. The following report details the previous and current work completed with particular reference to gold mineralisation. with regard to the current work conducted - full surveying of tenement boundaries has been undertaken during the year to relocate the leases with particular reference to the surrounding EL's. A full suite if aeromagnetic survey data has been purchased to aid further interpretation of the geology both locally and on the regional scale. The area of MLN's 657,659,682 and 683 overlie a granitic intrusion (part of the Cullen Batholith). The intrusion is heavily faulted and cross-cut with Quartz-Aplite dykes and veins. These dykes and veins have been extensively worked in the early 1900's for W, Mo, Bi and lesser Cu. There, is indication of gold mineralisation, however, its significance has got to be adequately assessed within the prospect. Minor pyrite-arsenopyrite -chalcopyrite has been found within veins at depth. These remain unexplored for gold potential. From the samples collected for this report, combined with results from Auridiams Report and previous geological and governmental reports it is suggested that the probability of economic gold mineralisation is low. The local geology is strongly reminiscent of other classical Cu, Mo - sulphide porphyry deposits where a similar mineralogical suite of sulphides may be found, and in most cases there deposits also rarely contain economic quantities of either gold or silver. Discrete rock chip sampling has allowed examination of most potentially mineralised rock types including greisenised and hornfelsed specimens but it has failed to located any thing other that a narrow aplite dyke significantly gold mineralised. Aeromagnetic mapping and interpretation has failed to located any significant signature associated with the mineralisation. The geology and mineralisation style of the Yinberri Wolfram field is at first approximation, strongly reminiscent of other porphy copper! molybdenite deposits and perhaps.contains further potential as a continued Mo, W, Cu, + Bi deposits. Whilst there is some indication of possible gold mineralisation, further work is required to assess the full potential.