overburden

[v. oh-ver-bur-dn; n. oh-ver-bur-dn]
verb (used with object)
1.
to load with too great a burden; overload: He was overburdened with cares.
noun
2.
an excessive burden.
3.
Also called burden, capping. Mining. waste earth and rock covering a mineral deposit.

Origin:
1570–80; over- + burden1

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
overburden
 
vb
1.  (tr) to load with excessive weight, work, etc
 
n
2.  an excessive burden or load
3.  geology the sedimentary rock material that covers coal seams, mineral veins, etc
 
over'burdensome
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

overburden
"to put too much weight on," 1532, from over + burden. Earliest uses are figurative.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Mining produces tremendous amounts of overburden that is laden with heavy
  metals.
Most people have seen piles of overburden on steep hillsides below the mines.
Five aquifers exist at this site: one overburden and four bedrock.
The overburden may need to be consolidated with low pressure grouting
  techniques.
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