lode

[lohd]
noun
1.
a veinlike deposit, usually metalliferous.
2.
any body of ore set off from adjacent rock formations.
3.
a rich supply or source.
4.
British. a waterway or channel.

Origin:
before 900; Middle English; Old English lād way, course, carrying; cognate with Old Norse leith way, route, Old High German leita procession. See load, lade, lead1

load, lode.
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Collins
World English Dictionary
lode (ləʊd)
 
n
1.  a deposit of valuable ore occurring between definite limits in the surrounding rock; vein
2.  a deposit of metallic ore filling a fissure in the surrounding rock
 
[Old English lād course. Compare load]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

lode
original M.E. spelling of load (q.v.), and custodian of most of the original meaning of "way, course, carrying." Differentiation in sense took place 16c. Mining sense of "vein of metal ore" is from c.1600, from notion of miners "following" it through the rock.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
lode   (lōd)  Pronunciation Key 
A vein of mineral ore that is deposited between clearly demarcated layers of rock or that fills a fissure in a rock formation.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Britannica
Encyclopedia

lode

in geology, ore body that is disseminated within definite boundaries in unwanted rock or minerals (gangue). The term, as used by geologists, is nearly synonymous with the term lode, as used by miners. There are two distinct types: fissure veins and ladder veins.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
But there's already a growing lode of biometric data on travelers.
Combine that with the ready lode of oxygen-rich ilmenite, and you've got a
  prime spot for a future moon base.
Beneath the artifacts of camp and cape, they located a rich lode of myth.
There are two types of mining claims, lode and placer.
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