Scout drilling undertaken by hand, on a number of salt lakes in the hundred of Haines, and isolated lakes in the hundreds of Newland and Dudley on Kangaroo Island, indicates that no gypsum occurs in these lakes. Without exception, mud and clay overlie a travertine limestone lake bottom at comparatively shallow depth. Testing of the previously known occurences of gypsum on Miscellaneous Lease No 466 (cancelled), an extension of the main deposit on Salt Lake, Hd. of Haines, indicates an additional reserve to those already proved of 150,000 tons but of doubtful economic value.