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| OM Group [NYSE:OMG] - Big Hill (Lumbumbashi) Copper/Cobalt Tailings, DRC. |
| ORH Limited [ASX:ORH] - Mining Services |
| O.T. Mining [Pinksheets:OTMN] - Developing the Ruby Mine (Montana, USA), and several mining projects in Quebec via Namex Explorations (25% owned) |
| OZ Minerals [ASX:OZL] - Second largest producer of zinc in the world, a substantial producer of copper, lead, gold, silver and growing in nickel. Formed in 2008 through a merger of Oxiana Limited and Zinifex Limited |
| Oakland Resources [ASX:OKL] - Silurian Gold Province of New South Wales. |
| Oasis Diamond Exploration became Temoris Resources, now Glen Eagle Resources |
| Obtala Resources [LSE:OBT] - Mineral assets in Tanzania |
| Ocean Park Ventures [TSX-V:OCP] - Chisna gold copper Project, South Central Alaska, south side of the Alaska Range. |
| Oceana Gold NL [ASX:OGC] - Goldfields in the South Island of New Zealand |
| Oceanic Iron Ore [TSX-V:FEO] - Iron ore project in the Ungava region of northern Quebec |
| Octagonal Resources [ASX:ORS] - Central Victorian Goldfields and the Eastern Goldfields of Western Australia |
| Odin Mining [TSX-V:ODN] - Gold production and exploration in the Sierra region (south of Quito) in Ecuador. |
| Odyssey Marine Exploration [NASDAQ:OMEX] - Archaeological excavation and recovery of specie and artifacts from shipwreck sites. |
| Odyssey Resources [TSX-V:ODX] - Focus on base and precious metals across the Middle East and North Africa. |
| Oklo Uranium [ASX:OKU] - Mail and Australia |
| Oliver Gold became Canico Resource, which was acquired by Vale |
| Olympia Resources is now Matilda Zircon |
| Olympus Pacific Minerals [TSX:OYM] - Vietnam gold exploration. |
| Omax Resources is now Euromax Resources |
| Omega Corp Limited was acquired by Denison Mines |
| Omineca Mining [TSX-V:OMM] - Western Canada |
| Omnium Nord Africain [private] - Morocco |
| 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] - Properties in Argentina and Canada (Kidd Creek Ontario) |
| Oracle Mining [TSX-V:OMN] - Oracle Ridge Mine is an underground copper mine located in Marble Peak on the north side of the Santa Catalina Mountains, Arizona (was Gold Hawk Resources) |
| Orbite Aluminae [TSX-V:ORTa] - Unique technologies for extracting metallurgical-grade alumina |
| Ord River Resources [ASX:ORD] - Objective is to explore for gold and base metals, in particular copper and nickel |
| Oregon Resources [wholly-owned by Industrial Minerals Corporation] - Developing mineral sand (chromite, zircon, garnet) projects in southwestern Oregon. |
| Oremex Resources [TSX-V:ORM] - Silver and gold mineral properties in Mexico. |
| Oremine Resources Strong portfolio of gold and base metal projects in Turkey. |
| Orestone Mining [TSX-V:ORS] - Focused on gold-copper exploration in the Stikine and Quesnel regions, BC |
| Orex Exploration [TSX-V:OX] - Nova Scotia |
| Orex Minerals [TSX-V:REX] - Peru |
| Orezone Resources was acquired by IAMGOLD |
| Oriel Resources was acquired by Mechel |
| Oriental Minerals is now Woulfe Mining |
| Oriental Peninsula Resources [PSE:ORE] - Nickel in the Philippines |
| Original Sixteen to One Mine One of the last remaining hard-rock gold mines in California |
| Orion Gold [ASX:ORN] - Walhalla goldfields of Victoria. |
| Orion Metals [ASX:ORM] - Queensland projects |
| Orissa Mining [state owned] - Mining in India |
| Orko Silver [TSX-V:OK] - Gold and silver in Mexico |
| Ormonde Mining plc [LSE:ORM] - Irish-based company actively seeking exploration opportunities in precious metals, with a focus on Iberia and Morocco. |
| Oro Mining [TSX-V:OGR] - Gold and silver exploration-mining company with advanced staged projects in Mexico |
| OroAndes Resources is now Fort St James Nickel |
| 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 [TSX:OLE] - Mineral exploration in Senegal, West Africa and Brazil. |
| Oromonte Resources is now Georox Resources |
| Oropa Limited is now Sihayo Gold |
| Orosur Mining [TSX-V:OMI] - Operates the only producing gold mine in Uruguay (San Gregorio). Exploration in Uruguay, Chile, and Argentina. (was Uruguay Mineral Exploration) |
| Oroya Mining [ASX:ORO] - Mt. Gibson Gold Project |
| 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 [TSX-V:ORN] - Development of precious and base metals projects in China |
| Orsu Metals [TSE:OSU] - Gold and base metal projects in Kazakhstan and Kyrgyzstan. |
| Orvana Minerals [TSE:ORV] - International minerals exploration company with properties in North and South America, the Caribbean and Europe. |
| Osisko Mining [TSX:OSK] - Canadian Malartic gold deposit in Quebec, Canada. |
| Otis Gold [TSX-V:OOO] - Gold projects in Idaho and Nevada |
| Otish Energy is now Arrowhead Gold |
| Otter Gold was acquired by Normandy, now Newmont |
| Otterburn Ventures is now Finore Mining |
| Outback Metals [ASX:OUM] - Northern Territory |
| Outcrop Explorations Limited [private] - Exploring for VMS and precious metal vein style deposits in the Cobalt mining camp, Ontario. |
| 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 |
| Oxus Gold plc [LSE:OXS] - Gold projects in Kyrgyzstan and Uzbekistan. |
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| GOLDSHEET Mining Directory - Companies O | |
|---|---|
| Companies | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q-R | S | T | U-V | W-Z |
| Sectors | Australian | Copper | Diamonds | Moly | Nickel | Platinum | Silver | South Africa | Uranium |
| Info | History | Mutual Funds | Obsolete | Organizations | Prospecting | Publications | Quotes | Services |
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