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Golden Rim Resources Ltd announced that a number of significant gravity targets have been identified directly along strike from the Falun Mine in Sweden.
The Falun Project, located 200km NW of Stockholm, is part of the Bergslagen JV between Golden Rim’s Abu-Dhabi based alliance company, Royal Falcon Mining LLC and Drake Resources Ltd. The Falun Project comprises six licences covering 101km2 around the historic mining centre of Falun. Golden Rim’s Managing Director, Mr Craig Mackay, said the recently completed gravity survey over the 8km of mine host rocks within the Company’s Falun 100 permit was highly successful. “These anomalies present exciting opportunities for near-mine exploration during the next phase of the Bergslagen JV,” said Mr Mackay. Gravity surveys are designed to detect dense bodies, such as massive sulphide mineralisation, and this survey has outlined at least six major new targets in the vicinity of the historic massive sulphide copper-gold-zinc ore body at Falun. “These gravity high target areas have been subject to little or no previous drilling and as such, the drill testing of these anomalies is now a very high priority for the Berglsagen JV partners,” he said. Royal Falcon is funding a major exploration program on the most prospective copper and gold prospects in the Bergslagen JV. Background Falun is one of the great polymetallic deposits of the world (past production is thought to be 35 million tonnes @ 1-3% copper, 3-6% zinc and 0.5-3 g/t gold). The Bergslagen district, in which it lies, hosts a number of other high quality mines such as Garpenberg (60 million tonnes @ 5% zinc, 2% lead, 0.1 % copper, 100 g/t silver and 0.3 g/t gold) and Zinkgruvan (55 million tonnes @ 11% zinc, 1.5% lead and 94 g/t silver). The host sequence of Falun cannot be easily traced using aeromagnetic or airborne EM data due to cultural effects. However, the mineralised mine sequence can be followed in drilling around the old mine and also by the presence of small copper and zinc occurrences. The Skyttgruvan deposit lies just west of the Falun 100 permit, and demonstrates the position of the sequence at that point. Due to the massive, and dense, nature of massive sulphide mineralisation gravity has been applied successfully in the discovery of ore bodies of this type elsewhere in the world. Consequently, at Falun, it is anticipated that ground gravity would be able to discern potential ore bodies within the host sequence. Results The survey was completed by SMOY, of Finland, using a Scintrex CG3 gravity meter coupled with a Topcon GR-3 VRS for positioning of data points. The lines were nominally 200m apart and data was collected at stations every 100m. Data from the survey was subject to 3D inversion modelling. The resulting data show a distinctive residual gravity trend running westward from the Falun Mine that appears to link up with the Skyttgruvan deposit. Along this ridge there are a number of discrete residual gravity highs that are of potential interest (anomalies A to C). Nearest the mine, a larger residual gravity anomaly lies close to previous drilling that intersected rocks of the mine sequence which have base metal mineralisation and are strongly altered (anomaly D). Furthermore, to the south east of the mine a further residual gravity anomaly shows great potential (anomaly E). Previous drilling in the area shows that the gravity high is coincident with typical mine sequence alteration. A surface drill hole, completed in 1971, intersected siliceous alteration as found at the Falun mine, throughout all of its 752m length. Traces of copper mineralisation were found at 550 and 600m depth down the hole. In the easternmost reaches of the licence a residual gravity anomaly (F) lies coincident with a VTEM anomaly delineated in previous exploration. More information, click here |
