Spear Project Summary
The Spear Project is located in the NNE region of the Pentland District. The Pentland District lies within the Early Paleozoic Igneous Belt which is bounded by deep seated structures to the north and south. Pentland is characterized by widespread shows of mostly gold and to a lesser degree base metal mineralization; a situation shared with many mining districts that host major ore bodies. This suggests that the geological setting is permissive for a major ore body to be present in the district. The larger historical deposits are the Charters Towers vein systems which produced over 224 tonnes of Gold.
The Spear project area covered by this EPM application (EPMA) is centered over a prospective portion of Pentland District and surrounded by several precious metal (Au-Ag) historic mines and advanced prospects which have received sporadic exploration over the past 25 years.
Location & Access
The tenement is located 20 kilometres north of the township of Pentland on the Flinders Highway west of Charters Towers, in north Queensland. Access is by an unsealed track which leaves the Flinders Highway 3 kilometres west of the Cape River Bridge and runs northwest to Mount Stewart homestead.
Major Historical and Exploration Notes
The Brilliant Brumby Mine was discovered and worked from 1937 to 1940, and sporadically thereafter in 1947 and 1961. Total recorded production is 790 ozs (24.6 kg) from 950 tons of ore. Mineralisation at the Brilliant Brumby Mine is hosted by quartz veining trending north-south, in contrast to the general NE-SW trend of major faults and lineaments.
Sampling around and to the south of the Brumby workings located more workings not marked on the geological sheets and apparently not under claim; also located was a quartz reef displaying similar characteristics to those at the Brumby. Samples fi:om this reef (1-1.5 m x 300 m) were anomalous, ranging from 0.11 g/t to 4.96 g/t Au, and averaging 0.95 g/t Au.
The Surprise Mine is a prospect appears not to have been worked for many years. The workings are of limited strike extent but alteration exists over a reasonable width, in the order of 50 m. The alteration zone was found to carry 0.16 g/t Au, the qurutz 1.07 g/t Au.
The Lolworth granite appears to contain potential for small to medium sized mesothermal vein occurrences of the type found at the “Brilliant Brumby’. In particular the western fork of Mundic Creek requires follow-up ofthe anomalous va lues obtained and the repmted pits. Particular interest should be paid to areas marginal to the Mundie complex as existing mineralization may well have been re-mobilised to higher grades.
InterGroup Mining therefore believes that the Pentland District is highly prospective and warrants further exploration for vein style and porphyry related breccia hosted deposits.
The majority of the area is underlain by granitoids of the Lolwmth Igneous Complex (Fig. 3). This is regarded as a postorogenic batholith. It consists mainly of massive biotite adamellite and granodiorite, but a zone of banded pegmatit ic and aplitic garnet-muscovite granite and adamellite occurs on the eastern margin. Dykes of gametiferous muscovite pegmatite, granite and aplite are abundant within the complex. The age of the complex has been radiometrically dated as ranging from Upper Silurjan to Lower Devonian (Vine and Paine, 1974).
To the east of the EPMA, the Mundie Igneous Complex intrudes the Lolworth Complex. This complex is a group of subvolcan.ic stocks, bosses, dykes and minor volcanics. The main body is a microgranite epixonal stock forming Mt. Stewrut. The complex probably is the sorce of gold and minor base metal renationalisation at Mt. Stewrut and Lolworth to the north of the Authority.
Both the Lolworth and Mundie Igneous Complexes are overlain by the Tertiary (Pliocene) Campaspe Beds. The Campaspe Beds comprise clayey and gritty sandstone, conglomerate and siltstone. The presence of fossil alluvial gold near the base of the Crunpaspe Beds in the Cape River Deep Lead suggest that these outcrops should be regarded as a prospective target for gold exploration.
Unique Position of InterGroup Mining to Optimise Future Exploration in the Spear Project EPM Application Area
InterGroup Mining are the beneficial owners of the past 30 years of exploration results and expertise carried out over the Pentland District covered by the Spear Project EPM Application.
InterGroup Mining will have access to the complete open file exploration data base. Terrasearch also has access to numerous additional technical reports and data as well as the exploration expertise and support built up over twenty years exploring within North Queensland and more specifically the Pentland District.
Targets within the Project Area
The principal aim of The Spear Project EPM application is to continue to explore for vein/stockwork precious metal mineralization.
Two target areas have been identified for ground follow up (fig 12), the area west of Brilliant Brumby Mine along north east – south west trending fault and the area in no1th of application area where previous work returned anomalous gold in stream sediment sampling.
There is an excellent chance that future exploration will locate more substantial deposits by utilizing the high quality geophysical, TM and geochemical data sets now available. Successful target generation could follow the identification of conducive plumbing systems which have focused fluid flow into the intrusives. Overlay of these plumbing systems with the reinterpretation of geology and the other data sets will underpin the next phase of exploration over the Spear Project area.
Previous discoveries have been made by the successful application of exploration techniques such as surface geochemistry, electrical geophysics, geological mapping, bedrock RAB drilling and target drill testing. With the advances in geophysics, especially airborne and ground magnetics systems, complemented by TM imagery and extensive geochemical datasets as well as new and revised models of mineralization InterGroup Mining still regard the area as being highly prospective.
The 30 year exploration history by both major and junior companies available to the company will act as a “springboard” to fast track exploration on the most prospective areas including previous mines. The local exploration expertise and previous history working on these areas by Terrasearch gives the company a competitive advantage in exploration within the Pentland District.