Legend Mining Limited (ASX:LEG) believes it is onto a large mineralised target at the Mawson Prospect within the Rockford Project in Western Australia following the receipt of results from a recent detailed gravity survey.
Managing Director, Mark Wilson, said the company is now preparing to test the gravity and new geochemistry targets at Mawson’s with a reverse circulation (RC) drilling programme.
The size, strength and location of these gravity highs between the two geochem anomalies makes this a very exciting feature of the Mawson story,” Mr Wilson said.
“The footprint that has now been interpreted, demonstrates the current extent of the large mineralised Mawson system.
“We have scheduled an RC drill programme to commence as soon as possible, which is designed to provide the geology to help identify the source of the massive sulphide mineralisation which we have already discovered.”
The Mawson gravity survey comprising 2,325 stations at 50m x 50m and 100m x 100m spacings covering 10.8 sq. km was aimed at providing high resolution data to better define the main 4mgal gravity high and to be used in conjunction with aircore drilling to assist deep drill targeting.
Recent and historic aircore drilling at Mawson has defined two coherent Ni-Cu anomalies which straddle the gravity highs. The western anomaly relates directly to the Ni-Cu sulphide mineralisation identified in diamond drilling, while the larger 1,100m x 200m eastern anomaly (open to the east) lies on the eastern and south-eastern margin of the main gravity trend.
Mr Wilson said that importantly, all aircore drillholes from both the western and eastern Ni-Cu anomalies intersected mafic or ultramafic intrusives in bottom of hole samples. Conversely, aircore drillholes over the gravity highs intersected metasediments or granulite and returned no anomalous Ni-Cu results.
He said that the gravity highs however, cannot be explained by low density metasediments/granulite and are interpreted to represent dense mafic/ultramafic intrusives directly underlying the metasediments/granulite.
The company believes that deeper drilling through the metasediments/granulite into the gravity high will intersect prospective mafic/ultramafic intrusives.
It believes it is possible that this gravity high may represent the primary source of mineralisation identified in the Mawson diamond drilling to date.
The upcoming RC drilling programme has been designed to test a combination of gravity and aircore geochemical targets.
The proposed exploration programme at Mawson includes.
- An RC programme to test a combination of gravity and aircore geochemical targets.
- Diamond drill testing Northeast Mawson conductors D13 and D15.
- Complete 200m x 200m aircore drilling programme.
- LF-FLTEM over Mawson D1 conductor following up an offhole feature,
- Ongoing regional MLTEM survey at South Mawson
