Crushing, Screening & Conveying

Crushing, Screening & Conveying2017-04-04T06:57:13-04:00
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Cost Efficient Crushing Trial for Heap Leach (3 replies)

2 months ago
redcastle 2 months ago

I have a small gold project that I am looking at conducting a heap leach trial of around 5,000 tons, I'm looking at the most cost effective way to do the crushing with regards to mobile plant hire as I think outright purchase is unsuitable at this stage. The ore is heavily weathered and very soft , but also has high clay content. Since it's a heap leach even if I lose a bit of optimal recovery it might be worthwhile if I can save much more on machine hire

The study work I have given to me for the project suggests a 160kw Jaw Crusher with a CSS of 80mm, a 150kw Cone Crusher with a CSS of 20mm and screen with an undersize setting of 20mm. All up the P100 is 20mm and P80 listed as 8mm, in the heap leach testwork it used a P100 of 12.5mm.

As that's 3 lots of plant, and 6 heavy haulage trips all up is there a way to perhaps get away with for example 1 Large Cone crusher with a grizzly feeder or don't worry about the screening plant? I was even looking at maybe an Impact Crusher like this which is available for hire.

it has built in screening, and might be more suitable. Also does anyone have ballpark figures on what one of those large tracked cone crushers costs to hire per day? Im in Australia so any figures would be good to get an idea of what I'm looking at.

2 months ago
Jorge 2 months ago

I believe you should evaluate the effect of agglomeration on gold extraction. Usually, when the clay content is high, it is important to agglomerate the ore to avoid some problems such as channeling of solution flow. If you evaluated this point, now, you should prepare a cash flow to estimate your profit. 

Master Q
2 months ago
Master Q 2 months ago

Heavily weathered and very soft ore with high clay content suggests using a cone crusher would be a poor decision. You can use a cone with high clay content but would risk packing unless you flushed the chamber while crushing. This has its issues and since you don't need a cone as the ore is weathered and very soft I would go for an impact crusher for the test. Unless the ore is particularly abrasive its the cheapest option. 

2 months ago
redcastle 2 months ago

Sorry I forgot to mention I have agglomeration testwork and it needed fairly high values of cement for adequate percolation, I also forgot that cone crushers can have troubles with high clay content and I'm not sure this was factored in the test study. I think a single Impact crusher setup will be simpler, cheaper and the way to go.

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