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QMX Gold [TSX:QMX] - Focused on mine development and gold production in Quebec and Manitoba, Canada.
ORH Limited [ASX:ORH suspended] - Mining Services
O.T. Mining [OTC:OTMN] - Developing the Ruby Mine (Montana, USA), and several mining projects in Quebec via Namex Explorations (25% owned)
OZ Minerals [ASX:OZL] - Owns and operates the high quality Prominent Hill copper-gold mine and Carrapateena advanced copper-gold exploration project, both located in South Australia.
Oakland Resources is now Castillo Copper
Oasis Diamond Exploration became Temoris Resources, now Glen Eagle Resources
Oban Mining chnaged it name to Osisko Mining on June 14, 2016.
Ocean Park Ventures became Dunnedin Ventures
OceanaGold [ASX:OGC] - Global gold mining company with a strong presence in Philippines, New Zealand and United States
Oceanic Iron Ore [TSX-V:FEO] - Iron ore project in the Ungava region of northern Quebec
Oceanus Resources [TSX-V:OCN] - Lajita Gold Property located in the south-west corner of Durango State, Mexico
Odin Mining is now Lumina Gold
Odyssey Marine Exploration [NASDAQ:OMEX] - Archaeological excavation and recovery of specie and artifacts from shipwreck sites.
Odyssey Resources [TSX-V:ODXh] - Focus on base and precious metals across the Middle East and North Africa.
Oklo Resources [ASX:OKU] - Commenced in 2007 as a uranium explorer, principally in Mali. Whilst maintaining its uranium interests, the company has since moved into gold and phosphate exploration in Mali.
Oliver Gold became Canico Resource, which was acquired by Vale
Olivut Resources [TSX-V:OLV] - Diamonds
Olympia Resources became Matilda Zircon, now MZI Resources
Olympus Pacific Minerals is now Besra Gold
Omax Resources is now Euromax Resources
Omega Corp Limited was acquired by Denison Mines
Omineca Mining [TSX-V:OMM] - Western Canada
ONA Group (Omnium Nord Africain) merged with Société Nationale d'Investissement (SNI) or National Investment Company, a large private Moroccan holding company controlled by the Moroccan royal family.
On Track Exploration - Uranium and iron ore properties in Northern Quebec and British Columbia.
Ongopolo Mining was acquired by Weatherly International plc
Ontex Resources and Roxmark Mines merged to form Goldstone Resources, now Premier Gold Mines
ONTZINC is now Hudbay Minerals
Opawica Explorations [TSE_V:OPW] - Teck-Kirkland Property (near Kirkland Lake, Ontario) and Bro Property (Yukon Territory)
Oracle Mining [receivership] (was Gold Hawk Resources)
Orbis Gold (was Mt Isa Metals) was acquired by SEMAFO
Orbite Aluminae [TSX:ORT] - Unique technologies for extracting metallurgical-grade alumina
Ord River Resources is now Vango Mining
OreCorp [ASX:ORR] - Projects in Ethiopia and Mauritania. (was Silver Stone Resources)
Oremex Silver is now Monarca Minerals
Orestone Mining [TSX-V:ORS] - Focused on gold-copper exploration in the Stikine and Quesnel regions, BC
Orex Exploration was acquired by Anaconda Mining
Orex Minerals [TSX-V:REX] - Peru
Orezone Gold Corporation [TSX:ORE] - Bomboré gold deposit in Burkina Faso.
Orezone Resources was acquired by IAMGOLD
Oriel Resources was acquired by Mechel
Oriental Minerals became Woulfe Mining, acquired by Almonty
Original Sixteen to One Mine One of the last remaining hard-rock gold mines in California
Orinoco Gold [ASX:OGX] - Brazilian-focused gold company
Orion Gold [ASX:ORN] - Walhalla goldfields of Victoria.
Orion Metals [ASX:ORM] - Queensland projects
Orion Minerals Group is now CSM Group
Orko Silver was acquired by Coeur Mining
Orla Mining [TSX-V:ORA] - Cerro Queman, Panama.
Ormonde Mining plc [LSE:ORM] - Irish-based company actively seeking exploration opportunities in precious metals, with a focus on Iberia and Morocco.
Oro Mining is now Marlin Gold Mining
Oro Verde [ASX:OVL] - Chuminga Copper/Gold Project located in Northern Chile and the Vega Gold Project situated in the highly prospective El Indio Gold Belt of Chile
Orocan Resources is now Standard Graphite
Oroco Resource [TSX-V:OCO] - Cerro Prieto Project in northern Sonora State, Mexico.
Orocobre [ASX:ORE] - Lithium-potash resource developer in the prolific Puna Region of Argentina.
Oromin Explorations is being acquired by Teranga Gold
Oromonte Resources is now Georox Resources (oil and natural gas in Western Canada)
Oropa Limited is now Sihayo Gold
Orosur Mining [TSX:OMI] - Operates the only producing gold mine in Uruguay (San Gregorio). Exploration in Uruguay, Chile, and Argentina. (was Uruguay Mineral Exploration)
Oroya Mining is now Dakota Minerals
Orphan Boy Resources is now International Bethlehem Mining Corporation
Orrex Resources [ASX:ORX] - Australian resources company with two large gold exploration projects in Western Australia
Orsa Ventures was acquired by Alamos Gold
Orsu Metals [TSE-V:OSU] - Gold and base metal projects in Kazakhstan and Kyrgyzstan.
Ortac Resources [LSE:OTC] - Precious metal projects in Europe.
Orvana Minerals [TSE:ORV] - International minerals exploration company with properties in North and South America, the Caribbean and Europe.
Osisko Gold Royalties [TSX:OR] - Québec-based royalty and stream company. Osisko currently owns a 5% net smelter return royalty (“NSR”) on the Canadian Malartic Mine.
Osisko Mining [TSX:OSK] - Focused on the acquisition, exploration, and development of precious metal resource properties in Ontario and Quebec, Canada. (formerly Oban Mining)
Osisko Mining Canadian Malartic Mine was acquired by Agnico Eagle Mines and Yamana Gold
Osprey Gold Development [TSX-V:OS] - Nova Scotia gold projects
Otis Gold [TSX-V:OOO] - Gold projects in Idaho and Nevada
Otter Gold was acquired by Normandy, now Newmont Mining
Otterburn Ventures is now Finore Mining
Outokumpu [NASDAQ OMX:HEX24321] - Versatile metals group (base metals production, stainless steel, copper products and technology.) operating worldwide.
Overland Resources [ASX:OVR] - Yukon Base Metal Project
Ovoca Gold [LSE:OVG] - Exploring for Platinum, Gold and Zinc in Russia, Sweden and Ireland
Oxiana Resources merged with Zinifex Limited to form OZ Minerals
OZ Minerals [ASX:OZL] - Owns and operates the high quality Prominent Hill copper-gold mine and Carrapateena advanced copper-gold exploration project, both located in South Australia.


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