Annual report Tennant Creek Project Polly Plains Prospect MCC485 to 490

Abstract

Geology - There is little outcrop over the area and only a small area in the central southern tenements was mapped. A quartz vein trends west-north-west/east-south-east through the area but is composed only of grey-white buck quartz with no hematite associated with it. The abuting hill appears to reflect an eastward plunging anticline capped in part by porphyry. This tendency towards easterly plunging structures is also seen further north in the eastern part of the Mint prospect. The plunge is probably quite shallow given the similar plunge of those to the north, there being no actual plunge indicator. There are a number of approximately north-south trending tensional quartz veins with westward dips. Geochemistry - Lag sampling was restricted to the southern area, where 53 samples were taken, and analysed for gold (to ppb levels), copper and bismuth. The area was limited because of the broad wash which covers a large part of the tenement block. Stream incisements indicate that there is in excess of two metres of transported material which would make lagging of the remaining area a useless exercise. Results were disappointing, the maximum assays being 5 ppb Au and a 20 ppm Cu. Geophysics - The Polly Plains prospect is included in an area flown by Aerodata for magnetics and radiometrics. Line spacing was 200 m and flight height 60 m. Results from this survey have been processed and interpreted by Aerodata. There is no indication of any obvious magnetic targets within the Polly Plains block, but several prominent lineaments, that are spatially associated with historic workings nearby, pass through the area.

The radiometrics may be of limited use due to strong absorption of gamma radiation by the transported overburden.