Castle Minerals Limited announced that an extensive review of historical open-file reports has confirmed that previous explorers encountered several zones of base metal anomalism on the recently applied for Withnell and Terra Rossa exploration licences in the Earaheedy Basin region of Western Australia (Castle's five licence applications extend for a combined 863km2 and have been explored over the past forty years by a series of companies searching for various styles and combinations of base metals, gold and diamonds. These companies have included CRA Exploration Pty Ltd. ("CRAE"), Esso Minerals Ltd, Western Mining Corporation Limited, Plutonic Gold Mines Ltd, RGC Exploration Pty Ltd. ("Renison"), Placer Dome Limited, Kalamazoo Resources Ltd, Lodestar Minerals Limited and Pacmag Metals Ltd. Exploration on Castle's licences has included mapping, lag sampling, pisolite sampling, rock chip sampling, BLEG sampling, auger sampling, aeromagnetics, VTEM, RAB, aircore, RC and core drilling. This work was of a good quality for its time but was not especially directed towards the discovery of the broad SEDEX style of mineralisation as is being interpreted at the Rumble Resources Ltd. ("Rumble") held Chinook-Magazine prospects. Nevertheless, the work provides an invaluable platform from which to advance exploration at Earaheedy. RC and diamond drilling by Renison intersected low-level zinc and lead anomalism on the Withnell licence including at the Sioux prospect. It also recorded a lithological sequence very similar to that at the Chinook and Magazine zinc-lead discoveries to the west, with the Sioux anomalism appearing to be hosted in a similar lithological zone. Historical reports, 1:100,000 scale GSWA mapping covering the Withnell application and projections of lithologies to surface indicate that the Withnell licence could host approximately 3.5km strike of the prospective Lower Frere Formation - Upper Yelma target lithological zones. Confirming the exact collar position of the Renison drill holes will be Castle's priority activity in a field verification and reconnaissance exploration program which will commence shortly. Castle also notes that the prospective lithological unit dips very gently to the northeast. The projected depth at which the mineralised unit on the Rumble licence appears on that portion of Castle's Withnell licence, which also abuts the northern boundary of the Rumble licence, is undetermined and will need to be confirmed by drilling.