If you're dealing with refuse (or waste) disposal, this is the expression. Here are some examples:

Erosion Control for Solid Waste Disposal Piles
Abstract:, The top surface of most waste disposal piles including uranium mill tailings piles consists of erodible soils capable of vegetative growth. ...
www.pubs.asce.org/WWWdisplay.cgi?0104550

SF Bay Enviro Groups Threaten Navy Suit
At the heart of this dispute is the company's waste disposal pile, which the environmentalists claim is polluted with high levels of mercury, copper, ...
www.albionmonitor.com/free/pointmolate.html

Environmental Impacts of Elliot Lake Mill Tailings
... a detailed study of a single waste disposal pile to the expected dose commitments and health effects for the total amount of tailings currently disposed ...
www.wise-uranium.org/udeli.html

The word "dump" may also be used, instead of disposal, especially if it's done in an abrupt, rough, or careless manner. Some examples:

Kelly Mine
... the turn of the century, as lead and silver were being wrenched from the earth, a discarded greenish rock was being tossed high on the waste dump piles. ...
www.rozylowicz.com/retirement/kelly/kelly.html

Utah copper firm keeps working to contain dust
... internal and external water flows and restoring habitat for wildlife also were the goals of reclamation work on several waste dump piles, some produced by ...
http://news.tradingcharts.com/futures/2/1/61708912.html


Here's Webster's definition for "dump":

dump1 (dump)
vt.
1 to throw down or out roughly; empty out or unload as in a heap or mass
2 a) to throw away (garbage, rubbish, etc.), esp. in a place set apart for the purpose b) to get rid of in an abrupt, rough, or careless manner

Tailings dump of uranium waste in Kirghizia threatened with ...
Tailings dump of uranium waste in Kirghizia threatened with destruction.
The Tectonic-1 giant landslide which is pending over the tailings dump of uranium ...
www.bellona.no/en/international/ russia/incidents/29489.html

Bioline International Official Site (site up-dated regularly)
Mineralogy of Tailings Dump around Selebi Phikwe Nickel-Copper Plant, Botswana ... The tailings dump comprised of the following minerals: nickelblodite, ...
www.bioline.org.br/abstract?id=ja04008&lang=en

common everyday term in Portuguese: botar algo fora..to throw something away...

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Note added at 11 hrs 50 mins (2005-07-21 13:18:11 GMT)
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Please note: there was a typo in my answer..

here they have placed the expression in quote marks..it literally means to throw away or discard...

it depends on what the piles are of..

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Note added at 11 hrs 54 mins (2005-07-21 13:21:27 GMT)
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the expression \"botar fora\" here means Discard Or Throwaway...

Rejeitos can be tailings in mining, as Airmail has pointed out.

The term Botar Fora itself is not technical at all..

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Note added at 11 hrs 56 mins (2005-07-21 13:23:43 GMT)
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Please also note: my answer is for your question re the word \"bota fora\" in quote marks..not for the entire phrase.

it might be useful for your glossaries if you are studying Portuguese..

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Note added at 11 hrs 58 mins (2005-07-21 13:25:54 GMT)
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The phrase can also be [x: rejeitos] discard pile..

Until we know exactly what is not wanted because it is not suitable for keeping, can\'t do better..

cheers

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Note added at 11 hrs 59 mins (2005-07-21 13:26:47 GMT)
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FRANKLIN MINERAL MUSEUM - FOR EDUCATORS
Although our primary focus is mineral science, geology, and local mining ...
This 15 acre tract of land is what is left of an enormous ***discard pile*** of lean ...

or scrap heap.....



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Note added at 23 hrs 50 mins (2005-07-22 01:18:14 GMT)
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to tell the stories of regulating Reserve Mining Company\'s taconite tailings,
... Advises consumers how to reduce the amount of ***throw-away waste**** by ...
www.pca.state.mn.us/about/advm.html - 46k - Cached - Similar pages

[PDF] Sorry, no loans made outside the State of Minnesota.
File Format: PDF/Adobe Acrobat - View as HTML
today: the Reserve Mining discharge of taconite tailings into Lake Superior, ...
Advises consumers how to reduce the amount of ***throw-away waste*** by careful ...
www.pca.state.mn.us/about/pubs/library-av.pdf - Similar pages

The International South Group Network
The granting of the mining lease by the then colonial administration had ...
It is seen as a resource for production or as a sink to throw away waste but it ...
www.isgnweb.org/pub/pubGenderTrade.htm - 94k - Cached - Similar pages

The WTO Doha Mandate
... we look at the living conditions of people who live around the mining projects,
when ... seen as a resource for production or as a sink to throw away waste but it ...
www.isgnweb.org/02-07-2.htm - 23k - Supplemental Result - Cached - Similar pages

SB428 SUB2 enr
... but not including the wastes of primary processes of mining, logging, ...
(3) \"It is a crime to burn, bury, abandon or throw away waste tires without ...
www.legis.state.wv.us/Bill_Text_HTML/ 2005_SESSIONS/RS/BILLS/SB428%20SUB2%20enr.htm - 143k - Cached - Similar pages

Here is the final: piles or heaps of throw-away waste

ie throw-away= bota fora

this is the term ..of course, there can be several ways to say it..



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Note added at 23 hrs 52 mins (2005-07-22 01:20:06 GMT)
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Note to everyone: I was only answering at the beginning with regard to Bota Fora..but guess what?? I found: throw-away waste...in a mining context..

so, please, everyone enjoy!!