Barrett, S, Beale, G & Reidel, J 2006, 'Mine Closure and Reclamation ⎯ Some Practical Examples in Different Climatic Settings', in AB Fourie & M Tibbett (eds), Mine Closure 2006: Proceedings of the First International Seminar on Mine Closure, Australian Centre for Geomechanics, Perth, pp. 453-462, https://doi.org/10.36487/ACG_repo/605_37
(https://papers.acg.uwa.edu.au/p/605_37_Barrett/)
Abstract: A number of major open pit hard rock mines have undergone closure over the past few years.  These closed 
operations provide a unique opportunity to compare actual geochemical conditions with those predicted, and 
to identify factors which had the greatest influence on the success of closure implementation.  This paper 
presents an overview of the open pit closure programs for the Sleeper mine in Nevada USA; the Golden 
Cross mine in New Zealand; and the Kori Kollo mine in Bolivia.  In each of these cases, the local climate 
had a significant influence on the closure measures selected.  Sleeper was the first of the current generation 
of large open pit gold mines in the western United States.  The mine was rapidly flooded and a productive 
200 m deep lake has been created.   Golden Cross includes an open pit and several phases of underground 
workings, dating from the early 1900s.   Following closure, the pit is allowed to free drain to an adjacent 
river. Kori Kollo lies next to the Rio Desaguadero and was the largest open pit mine on the Andean 
altiplano.  Upon closure, it was necessary to design a flooding program to induce stratification in the pit lake.