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I was filling this cloze test from a book (the bolded words are answers):

There are many methods of mining, each of which is based upon where a mineral deposit is found in the earth. While some mineral deposits are far ... , others lie at or near the earth surface. Several different mining methods are used when deposit occur close to the earth's surface.

Here are the choices for the blank:

a. away
b. deep
c. from
d. underground

I chose underground as the answer because it seems very logical and I don't suppose it will cause a grammatical error; however, the book says the correct answer is away.
I can't find any way to relate far away to depth. Are there any? Or is the book incorrect?
Any help would be highly appreciated.

closed as off-topic by ab2, Edwin Ashworth, Jim, NVZ, Mitch Aug 8 '16 at 15:47

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    I am a native English speaker and worked for a time on mining topics. Without looking at the options, I immediately thought "underground". I doubt that any mining engineer would refer to a deposit as "far away" in discussing the feasibility or cost of extracting a mineral. One could say that the mining operation would be far away from, say, the nearest good restaurant (many of them are), but unless one is referring to an operation in the asteroid belt, "far away" makes no sense in describing the location of a mining operation. One wonders what else the book got wrong. Good to question! – ab2 Aug 7 '16 at 20:15
  • Correction to previous comment: The site could be "far away from the nearest road or rail-head", so that a road would have to be built and/or a spur rail line built. This would affect the cost of extracting the mineral. – ab2 Aug 7 '16 at 20:28
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    Bury the book far underground and far away. After using it as fuel in a blast furnace. Assuming that '... others lie at or near the earth surface ...' and '... different mining methods are used when deposit occur close ...' actually appeared in the original. – Edwin Ashworth Aug 7 '16 at 21:19
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    I'm voting to close this question as off-topic because the question is probably caused by a typo in the book -- (d) should have been the correct answer, no doubt about it. – ab2 Aug 7 '16 at 21:32
  • @ab2 why don't you write your comments as an answer so that I can mark it as the answer? – Amen Aug 7 '16 at 23:29

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