FIGURE 3.14 Detailed geological cross section of the Coles Hill area constructed from Marline Uranium Corporation drill hole data (Marline Uranium Corporation, 1983). Vertical holes drilled within the plane of the cross section are shown as solid lines and are identified by well number and total well depth. SOURCE: Jerden (2001).

2001). Because of the abundance of feldspars and carbonates, extraction of uranium by an alkali leach process may be needed, but acid leaching would also need to be considered.

The Coles Hill deposit contains significant uranium resources at grades comparable to average grades for uranium deposits worldwide, and the main uranium-bearing minerals are easily leachable in acidic or alkaline solutions. Resource calculations for this deposit are shown in Table 3.2.

Comparable uranium deposits. The Cachoera deposit at Lagoa Real in Brazil (Cuney and Kyser, 2008) and the Novokonstantinovka deposit of the Central Ukraine district (Cuney et al., 2012) are both being mined at present, with production rates of several hundreds of tonnes of uranium per year and resources of several hundreds of thousands of tonnes of uranium. The Cachoera deposit in Brazil is an open-pit mine at present, and underground workings are being developed. The mine has been developed recently (<10 years) and therefore uses the best practices for uranium mining and ore processing.

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