NCU just released a Positive Feasibility Studty prepared by Tetra Tech if you want to see how they disclose results:

VANCOUVER, BRITISH COLUMBIA--(Marketwire - Jan. 23, 2012) - Nevada Copper Corp. (TSX:NCU) ("Nevada Copper") is pleased to announce the results of its definitive Feasibility Study for its 100% owned Pumpkin Hollow Copper Project located in Yerington, Nevada. The Feasibility Study was prepared under the direction of Tetra Tech, Inc. ("Tetra Tech"), an industry leading international engineering firm, with substantial input from Merit Consultants International Inc. ("Merit"), which compiled and reviewed the initial capital cost estimate. The Feasibility Study, with capital costs defined to within plus/minus 15%, builds upon two previous Preliminary Economic Assessments prepared by Tetra Tech, and significant metallurgical and geotechnical work completed in 2010 and 2011. The Feasibility Study confirms the technical and financial viability of constructing and operating a 67,500 ton-per-day copper mining and processing operation at Pumpkin Hollow.