Wellington is a small town on the Macquarie River about 200 miles north-west of Sydney (see Plate 1). These are several old mine workings - shafts, pits, costean, etc. - about 7 or 8 miles south-east of the town. Massive sulphide ore has been found and developed in one of these workings, namely, the main shaft of the Commonwealth Mine. A fairly big dump, which shows signs of good ore and some smelted material, is evidence that there was once a good bit of mining activity in the area. In 1951, the Consolidated Zinc Corporation became interested in the abandoned mine and arranged for the lease owner, Mr. George Wilkins, to de-water it. As pointed out in the report of the Company's geologist, nothing is known from the numerous old workings regarding the extent of the sulphide orebody. The purpose of the geophysical investigation was to determine if there is any extension to the known orebody and to provide the Company with drilling targets. The geophysical work was carried out from the end of July to the beginning of September, 1952, and it covered the whole of the old mining area, some 6,000 feet in length. The Consolidated Zinc Corporation carried out the necessary surveying work, such as pegging and levelling traverses, and the Company's drilling party assisted where necessary. The general results of the survey were discussed with representatives of the Company as soon as the field work was completed.
