If you have a 3D software and you know the measured angle of repose for the draw down. Duplicate the pile in the program and add the reclaim point(s) to the actual size and location. Create an upside down cone about the reclaim port based on the angle of repose. You can locate a vertex below the reclaim port. Delete this new volume from the original pile. Use the volume calculator from the program to give you before and after volume.

I do this a lot using Solidworks and I find it quite accurate assuming the angle of the draw down has been previously measured. ■

Alan Roberts, of TUNRA, has published various papers on stockpile reclamation and it should be possible to construct a spreadsheet from his formula. ■

Hello,

I do not have a direct answer to your question. However following information may be of use to you.

The material repose angle is in context of stockpiling or stacking operation and then resulting face angle to horizontal. I think there is concept of sluff angle which is applicable to zone being reclaimed by collapsing stationary material. I think sluff angle is few degree more than repose angle.

From the reclaimed hopper edges draw the reclaiming planes at sluff angle. The material within these planes and hopper face is reclaimable material (live reclaimable material).

You are estimating this quantity just for the purpose of knowing self reclaimable capacity. It is not for the purpose of sale and money payment. So 100% accuracy may not be necessary.

Also, repose angle or sluff angle are not very rigid figures. These will vary according to material condition (moisture content in the material or season, etc.). So inherently there will be some variation in the projected results.

Ishwar G. Mulani

Author of Book: ‘Engineering Science And Application Design For Belt Conveyors’. Conveyor design basis is ISO (thereby book is helpful to design conveyors as per national standards of most of the countries across world). New print Nov., 2012.

Author of Book: ‘Belt Feeder Design And Hopper Bin Silo’

Advisor / Consultant for Bulk Material Handling System & Issues.

Pune, India. Tel.: 0091 (0)20 25871916

Email: conveyor.ishwar.mulani@gmail.com

Website: www.conveyor.ishwarmulani.com ■

Originally Posted by Andy Jackson

Hello all

I Hope everyone is staying safe in these worrying times

I am looking to calculate the live capacity of a conical stockpile with tunnel reclaim

material will be crushed stone and I expect two reclaim feeders

working capacity needs to be 1000T minimum (circa 625m3)

now I can start the task of designing the stockpile from scratch but I wondered if there is any free software/spreadsheet that can do this for me

any assistance would be greatly appreciated

Stay safe

Andy

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Please help us to help us help you with this.

The live capacity is going to depend on the size of the draw point chutes and whether you intend to use air cannons and or vibrators as the cone of depression is going to be limited to the immediate diameter of the drawpoints and a little larger in radii

Are you in the United States? If so you will be regulated by the Mining Safety and Health Administrations jurisdiction and oversight with 4 inspections per calendar year.

We need more information as a thousand tons of aggregate material is very small in the scheme of things. You have not mentioned nothing in regard to the aggregate and whether you are mining it or purchasing a finished product like Halite and storing it under cover in a tall building

Are you intent upon using a conveyor with a stacking tube or a simple dumping arrangement with a steel tower and discharge chute?

It takes a lot of work to design a stockpile with twin draw points. Are you using a 24 inch conveyor of some type? Is it cable supported or steel frame conveyor?

What is the aggregate you wish to stockpile? Is the drive unit the head pulley or are you using a ground mounted drive unit with a hydraulic take up or a simple counterweight box in a pit using wire rope and pulleys to create belt tension?

A one thousand ton stockpile is very small in actual size equivalent to 10 one hundred ton standard gauge railroad open top hopper cars.

What is the aggregate you wish to stockpile?

Are you intent on stockpiling under dome using a hanging conveyor or a simple tower conveyor with the tower in the center of the stockpile using a telescoping discharge tube fed from the head pulley discharge chute.

Having twin drawpoints is an expensive proposition versus employing a narrow width apron feeder which will increase the amount of reclaim exponentially as the cone of depression in the stockpile can consume much of the stockpile that is in repose leaving little to push in or simply leave to create a barrier.

The bigger concern is controlling the diameter effectively as you have not mentioned if a barrier wall is going to be used to hold the stockpile in place on one side.

Candidly we need to know more about this if this is your first time wandering into the stockpile weeds, so to speak ■

These threads were merged as they were for the same question. 2nd duplicate question by OP was deleted.

Gary Blenkhorn - moderator ■