A 'Loop Cobra'Binder File containing documentation re. the Stuart McDonald Patent Water Trap. Australian Patent No. 132,110. Includes letters about whether the patent has expired or needs renewing, the formation of a Company with the name Stuart McDonald Patent Water Trap and receipts from companies that had already purchased the trapgold, mining, stewart mcdonald, water tap, gold miining, patents, stuart mcdonald, water trap.

Four page booklet describing some of the mines and mining techniques in the El Dorado district. The main two miines mentioned are the 'McEvoy' and the 'Cocks Pioneer' mines. The booklet was produced by the North Eastern Historical Society in 1968, Compiled by Colin AngusNorth Eastern Historical Societygold, goldfields, el dorado, gold mining, el dorado, cocks pioneer, mcevoy