A guide to leading practice sustainable development in mining
A guide to leading practice sustainable development in mining
A guide to leading practice sustainable development in mining
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To evaluate the acid rock dra<strong>in</strong>age risk, 101 drill core <strong>in</strong>tervals were carefully selected<br />
<strong>to</strong> represent the likely variability with<strong>in</strong> each geological rock type and assayed for<br />
sulphur, ANC and NAG. The results <strong>in</strong>dicated that about one third of the waste rock<br />
will be NAF and two thirds will be PAF, with only a small amount of High PAF m<strong>in</strong>ed<br />
and this will all occur <strong>in</strong> the last year of operation. NAF rock is produced up <strong>to</strong> year<br />
7 and from year 8 <strong>to</strong> the end of m<strong>in</strong>e life at year 11 all waste rock will be PAF. The<br />
schedule identified a need <strong>to</strong> re-handle NAF material <strong>to</strong> allow encapsulation of all<br />
PAF waste.<br />
The selected design option is <strong>to</strong> <strong>in</strong>corporate all waste rock with<strong>in</strong> the tail<strong>in</strong>gs dam<br />
and embankment <strong>to</strong> facilitate tight control on materials placement. All High PAF will<br />
be placed with<strong>in</strong> the tail<strong>in</strong>gs s<strong>to</strong>rage and all PAF waste will be placed, compacted and<br />
encapsulated with<strong>in</strong> the embankment. This case study demonstrates that prediction<br />
and quantification of AMD issues early <strong>in</strong> project <strong>development</strong> allows control<br />
strategies <strong>to</strong> be <strong>in</strong>tegrated with m<strong>in</strong>e plann<strong>in</strong>g and eng<strong>in</strong>eer<strong>in</strong>g design <strong>to</strong> m<strong>in</strong>imises<br />
long-term AMD liabilities.<br />
Figure 2.11 – Sari Gunay project <strong>in</strong> Iran<br />
50 LEADING PRACTICE SUSTAINABLE DEVELOPMENT PROGRAM FOR THE MINING INDUSTRY