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Gold/Mining/Energy : Gold and Silver Juniors, Mid-tiers and Producers -- Ignore unavailable to you. Want to Upgrade?

To: stan_hughes who wrote (66218)	7/15/2009 12:18:26 PM
From: hank2010	2 Recommendations Read Replies (1) \| Respond to of 78410

Good diagram! it shows a cut and fill mining method. In the example, the fill is probably quarried waste rock, not the paste fill that KGI is using (although when the Macassa mine was owned by others, they did use quarried waste rock.) The paste fill is cemented and is pumped into the stope, although once it starts down the holes no pumping is needed as gravity pressure will do the job and the objective will be not to get over-pressure. The paste will do a better job of filling all the voids, and when the cement sets up the compressive strength of the paste fill will provide better ground support than rock fill placed dry by gravity. In addition, with high grade gold, there will be less loss of free gold into the fill when paste is used. (When blasting and handling the ore, some of the heavy gold will migrate to the bottom and be lost in the unconsolidated rock fill.