A Heap Leach Plan

My Concept

• I’ll build one great big pad

• I’ll fill it in with rows of material about 40 feet high

• I’ll then fill in between the rows

• I’ll then build another line of rows on top

The Vision

Do Some Excel Estimating

Tonnage 200000000Density 3000 lbs/yd^3Volume 133333333 cubic yards

3600000000 cubic feet

Base Pad 4820 6120 29498400 122.0405 Min Required height244.081 Max Req. height

64.01338 40/Tan 32

Area 6560 feet squareVolume 40147200 cubic feet

89.67001 # piles needed

# 228 piles #100 fill ins Total15 14 4820

40 feet100 feet

32 degrees

228 feet

A Quick Handle on Trucks

Pad

Crusher

Quick Estimate Haul Distance(about 4000 feet)

Quick Estimates from Cat HandbookCat 793 takes about 6 minutesLoaded to go 4000 feetAnd about 2.1 for an empty returnAbout 1.2 minutes to dumpAbout 1 minute to loadTruck will take about 10.3 minutesA cycle(I can now start guessing myTruck requirements)

Another Cat Book Quicke

• A D11 can push 2600 loose cubic yards of material 100 feet in an hour

• I’ll dump and have the dozer push the material out

• I’ll work from the far end back

• I’ll do two piles at a time so they will be out of sync with each other.

Cost Estimating With Means

I will need toGrade about3.28 millionSquare yards

At 60 cents eachAbout 2 million

I Need a Clay Layer

If I put in a 2 feetOf compactedClay

1.39/cubic yardFor clay fill

3.28 millionX.67X1.39About 3 million

I Need to Compact the Clay

Looks like about86 cents perCubic yard

2.2 million cubicYards at 86 centsEach$1.9 million

Next I Need to Put Down a Geomembrane

Looks like about$1.03/square yd

3.3 millionSquare yards at$1.03$3.4 million

Next I Need a Rock Drainage LayerAbout 12 inchesOf spreadGravel at$5.55/ squareYard

3.3 millionSquare yards

$18.2 million

Total 28.5million

So What Else Do I Need

• I need an estimated flow rate for solutions• I need an SX plant flow rate• This will let me guess on Preg pond size

– I will need to build the Preg pond• I will need to buy pumps and sprinklers for the

solution distribution• I’ll need to run the pumps and maintain the water

lines• I’ll need to figure my truck haulage• I’m assuming I already have my delivery cost,

crushing costs, SX-EW costs