Perth, Nov 7, 2008 AEST (ABN Newswire) - Northern Mining Limited (ASX:NMI) is pleased to report that the completion of Stage 1 of a planned three stage geophysical survey programme at the Radzimowice Gold Project in Poland has produced positive results for the Company.
RADZIMOWICE GOLD PROJECT, POLAND (Northern Mining Limited 90%)
Very low frequency electromagnetic (VLF-EM) mapping has displayed the following:
- Conductive zones corresponding to gold ore veins which have been exploited historically
- Conductive zones showing probable continuation of known gold ore veins
- Conductive zones in areas where there are no previous indications of workings, which could indicate new gold mineralised zones.
The three stage programme is summarised as:
Stage 1: VLF-EM mapping, 10-metre spacing between measurement stations on 200m-spaced lines.
Stage 2: Detailed VLF-EM mapping, 5-10 m spacing, on short profiles 200-300m long located within certain areas.
Stage 3: Electrical Resistivity Tomography (Resistivity Imaging) measurements for detailed delineation of promising mineralized zones to quantify location, width and dip.
Results of VLF - EM Mapping
The data were first Fraser-filtered to transform cross-over anomalies to peaks. The anomalies were then superimposed on the geological compilation and the historical working locations. Anomalies on the profile lines were classified into three (3) categories reflecting high, medium and low conductivity zones.
Correlating selected anomalies between respective profiles of the three kinds of conductive zones resulted in:
1. Conductive zones interpreted to broadly correspond to ore veins which have been exploited historically.
2. Conductive zones corresponding to probable continuation of known ore veins.
3. Conductive zones in areas where there are no previous indications of workings, which could indicate new gold mineralised zones.
The application of the VLF-EM method at the Radzimowice Gold Project has shown the potential for extensions to the known partially exploited vein systems as well as for the discovery of new vein systems.
Chairman Alan Lockett commented that "The Radzimowice Gold Project is an exciting project for Northern Mining. These results provide an excellent base for future exploration programmes and highlight the prospectivity of the area".
The geophysics programme has been designed by our Polish geological consultant, in line with the conditions of the work programme submitted to the Polish Government with the concession application.
Northern Mining previously announced in its June 2008 Quarterly Report, that a three dimensional model had been digitised by CSA Global from a series of historical mining plans sourced from Poland and dating back to the 1910's.
The 3D model in conjunction with the results of the geophysical programme will be used for the planning of future exploration programmes (refer ASX announcement 31 July 2008 for more details).
Project Location:
The Project is situated in south-western Poland in the Kaczawa Mountains approximately 10 kilometres west of the town of Bolkow, near the town of Wojcieszow in Lower Silesia
History of Radzimowice Mining
Au-Cu-As-Ag mineralisation in the Radzimowice district has been exploited since the 15 - 16th centuries, with the processing of copper, arsenic, gold and silver ores. Mining continued intermittently until 1925, when the last mine in the Radzimowice district closed due to low demand and price for arsenic products. In 1952 - 53 the mines were re-opened with over 1,400 metres of new underground galleries constructed. The underground mining was abandoned in 1957.
Geology of Radzimowice Mineralisation
Radzimowice consists of two major areas of mineralisation, referred to as the south and north. The northern mineralised ore field is located between the Arnold and Luis shafts and contains five major mineralised veins namely Olga, Wanda, Alexandra, Maria, and Klara. The Miner's Consolation vein lies to the south of the Arnold shaft within the southern ore field. These veins are typically 180 - 320m long and 6 - 20 mm wide, except for the Miner's Consolation vein which is more than 2.4 km in length, 1.4m thick and extends to at least 240m in depth
At Radzimowice, gold-bearing quartz-sulphide-carbonate veins are related to Upper Carboniferous (c.a. 315 Ma) igneous rocks that comprise the Zelezniak rhyolite intrusion in the Kaczawa Mountains, situated in the Western Sudetes. The intrusion was emplaced into Paleozoic sedimentary-volcanic rock sequences of the Kaczawa metamorphic complex. Auriferous mineralisation is structurally controlled and hosted mainly by sericite-graphite schists and rhyolites which are weakly mineralized with disseminated gold grades of up to 2 g/t.
The mineralisation can be massive or occurs in the form of breccia, veinlets, stockwork or dissemination in the country rocks. Ore minerals are pyrite, auriferous arsenopyrite and chalcopyrite, and rarely galena, sphalerite and tetrahedrite. Gold occurs as refractory and microscopic-size grains.
NORTHERN MINING'S EXPLORATION PORTFOLIO - POLAND
The Radzimowice Gold Project complements the Company's exploration portfolio in Poland. NMI recently made a JORC compliant public announcement of an Inferred Mineral Resource of 16.8Mt @ 0.6% Ni for 94,000t contained metal at its Szklary Lateritic Nickel Project, located approximately 90 kilometres from Radzimowice (refer ASX announcement 29 July 2008).
Contact
CRAIG DAWSON
CHIEF EXECUTIVE OFFICER
Telephone (08) 9244 8499
Facsimile (08) 9244 3166
Website www.northernmining.com.au
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