TORONTO, ONTARIO — (Marketwire) — 08/12/11 — Caledonia Mining Corporation ("Caledonia") (TSX: CAL)(OTCBB: CALVF)(AIM: CMCL) is pleased to announce its second quarter and half year 2011 operating and financial results.The financial results below are reported in Canadian dollars, except where otherwise stated.Commenting on the results, Stefan Hayden, President and CEO, said: "Caledonia has had a very strong performance for the second quarter and first half of 2011. The further