Authors: Gonzales, V

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Gonzales, V 2005, 'Cobriza’s cu Tailings Surface Stacking A Successful story', in R Jewell & S Barrera (eds), Proceedings of the International Seminar on Paste and Thickened Tailings, Australian Centre for Geomechanics, Perth, pp. 261-270,

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Doe Run’s Cobriza mine site is located in the low central Andes of Peru. This article describes how Cobriza was able to overcome an environmental problem in strict accordance to government PAMA1 regulations and has been able to maintain the current mine operation by successfully installing the first paste surface disposal system in South America. Rheological requirements, design engineering, implementation – optimization and operating philosophy are thoroughly presented. Economic project impact issues are analyzed as well as technical and social aspects, and how all these, intimately correlate for an efficient operation.

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Paste 2005, Santiago, Chile 271
Surface Disposal
272 Paste 2005, Santiago, Chile
Cobriza’s cu Tailings Surface Stacking... Gonzales, V.
Paste 2005, Santiago, Chile 273
Surface Disposal
Photo 3: Start up with 20 cm spigot flexible
Photo 4: At 1 week of operation.
Photo 5: Minimum paste water bleed dis-
Photo 6: 10 cm diam. spigot discharge with
78% solids, and 65% passing 38 micron
Notice the “dry area” not yet covered.
Photo 7: Disposal at 1 month Notice the
steep slope.
Photo 8: Deposition slope and rain water
274 Paste 2005, Santiago, Chile
Cobriza’s cu Tailings Surface Stacking... Gonzales, V.
Photo 9: Disposal after 4 months. Photo 10: Disposal after 4 months.
Photo 11: CDT O/F Reclaim water with <
45 ppm solids avg.
Photo 12: Side wall construction, in the up-
per tailings section, with consolidated paste
after 4 months.

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