Rio, Newcrest, Antipa and GGP22 Feb 2020 14:44
21 Feb, 2020
Maiden resource nears for Rio Tinto's Winu amid 'corporate tension' in Paterson
Rio Tinto's Citadel junior joint venture partner Antipa Minerals Ltd.'s Managing Director Roger Mason says the major will unveil a maiden resource during the current quarter on the Winu copper discovery in Western Australia's Paterson Province, where he says "corporate tension" exists.
Mason told the RIU Explorers Conference in Fremantle, Australia, on Feb. 20 that Rio Tinto has amassed 13,000 square kilometers in the Paterson since discovering Winu, and in 2019 spent A$80 million on it, drilling out a deposit footprint of over 3 km by 1.6 km.
He told S&P Global Market Intelligence on the conference sidelines that Rio Tinto has done "what appears to be the vast majority of required drilling at Winu to get the resource out, which could be over the next month or so."
SNL ImageThe Citadel joint venture project between Rio Tinto and Antipa Minerals in Western Australia.
Source: Antipa Minerals
Rio Tinto's exploration license expenditure report — filed under the Western Australia Mining Act and accessed by S&P Global Market Intelligence — revealed Rio Tinto spent about A$79.7 million in total on what it called a copper-lead-zinc tenement during the 12 months preceding Oct. 12, 2019.
This year, Rio Tinto wants to understand the satellite opportunities, and Mason said a "significant component" of that opportunity is at Citadel, which the major formed with Antipa in 2015. Citadel hosts expandable resources of 1.6 million ounces of gold and 130,000 tonnes of copper, located 45 km from Winu.
In 2019, the joint venture completed a large-scale electrical geophysical survey and an airborne gravity survey across most of the 1,300-square-kilometer Citadel project.
Drill programs delivered intersections such as 310 meters at 0.6 grams per metric tonne of gold and 0.06% copper, beneath just 80 meters of cover at the Calibre deposit, which Antipa discovered in 2012 and is what attracted Rio Tinto to the region, Mason said.
This year's program includes further evaluation of the Calibre deposit and the broader Magnum Dome to "satisfy Rio Tinto's need to understand the Citadel project's immediate resource growth potential and Winu development synergies," he said.
The two resources that Antipa has at Calibre and Magnum are open in all directions. Calibre, a 1.3-Moz gold deposit with 70,000 tonnes of copper, has horizontal widths of up to 400 meters, is about 1.4 km long and has been drilled down to about 500 meters below the cover.
There is potential to materially increase those Citadel resources, plus higher grade zones also exist within that resource, which Mason said is important as "anyone who is developing a project wants the most valuable ore possible going through their mill as soon as possible to provide a quicker payback on their capital investment."
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