NEW YORK, Oct. 17, 2011 /PRNewswire/ -- OTC Markets Group Inc. (OTCQX: OTCM), the financial information and technology services company that provides the world's largest electronic marketplace for broker-dealers to trade over-the-counter ("OTC") stocks, announced that Caledonia Mining Corporation (OTCQX: CALVF; TSX: CAL; AIM: CMCL), an African focused mining, development and exploration company, is now trading on the highest tier of the OTC market, OTCQX®. (Logo: http://photos.prnewswire.com/prnh/20110118/MM31963LOGO) Caledonia Mining will begin trading today on the OTC market's prestigious tier, OTCQX International. Investors can find current financial disclosure and Real-Time Level 2 quotes for the Company on www.otcqx.com and www.otcmarkets.com. "OTCQX provides the highest level of visibility and access to U.S. investors possible in the OTC marketplace," said R. Cromwell Coulson, President and Chief Executive Officer of OTC Markets Group. "We are pleased to welcome Caledonia Mining to OTCQX." Collins Stewart LLC will serve as Caledonia Mining's Principal American Liaison ("PAL") on OTCQX, responsible for providing guidance on OTCQX requirements. About Caledonia Mining Corporation.Caledonia Mining Corporation (OTCQX: CALVF; TSX: CAL; AIM: CMCL) trades in the United States on OTCQX under the symbol "CALVF", in Canada on TSX under the symbol "CAL" and in the United Kingdom on the Alternative Investment Market of the London Stock Exchange under the symbol "CMCL". Caledonia Mining is an African focused mining, development and exploration company. Caledonia's main assets are the Blanket gold mine in Zimbabwe, which produces 40,000 oz of gold per annum, the Nama Cobalt/Copper Project in Zambia and the Rooipoort & Mapochs PGE Projects in South Africa. About OTC Markets Group Inc.OTC Markets Group Inc. (OTCQX: OTCM) operates the world's largest electronic marketplace for broker-dealers to trade unlisted stocks. Our OTC Link™ platform supports an open network of competing broker-dealers that provide investors with the best prices in over 10,000 OTC securities. We categorize the wide spectrum of OTC-traded companies into three tiers - OTCQX (the quality-controlled marketplace for investor friendly companies), OTCQB® (the U.S. reporting company marketplace for development stage companies), and OTC Pink™ (the speculative trading marketplace) - so investors can identify the level and quality of information companies provide. To learn more about how OTC Markets Group makes the unlisted markets more transparent, informed, and efficient, visit www.otcmarkets.com. Subscribe to the OTCQX RSS Feed at http://syndicate.otcmarkets.com/syndicate/rssPinkNews.xml SOURCE OTC Markets Group Inc.