SmarpanGamt wrote:Leaching, the recovery of copper from the drainage water of mines, as a method of the
extraction of minerals, it was well established as early as the eighteenth century, but until
about 25 years ago miners did not realize that bacteria take an active part in the process.
A. as a method of the extraction of minerals, it was well established
B. as a method of the extraction of minerals well established
C. was a well-established method of mineral extraction
D. was a well-established method of extracting mineral that was
E. had been a method of mineral extraction, well established

Please explain for option( A)

SmarpanGamt wrote:Please explain for option( A)

• "Leaching as a method of the extraction, it was well established in the 18th, but until recently minors did not realize x"

Patrick_GMATFix wrote:

SmarpanGamt wrote:Please explain for option( A)

Hello SmarpanGamt,

(A) is incorrect because it's a sentence fragment. To better analyze the sentence, ignore "the recovery of copper from the drainage water of mines" because this portion only severs the purpose of describing "Leaching" Thus A is saying:

• "Leaching as a method of the extraction, it was well established in the 18th, but until recently minors did not realize x"

The main clause is lacking a Verb; hence A is a fragment and cannot be correct. B commits the same error by the way.

Hope that helps,
-Patrick

SmarpanGamt wrote:

Patrick_GMATFix wrote:

SmarpanGamt wrote:Please explain for option( A)

Hello SmarpanGamt,

(A) is incorrect because it's a sentence fragment. To better analyze the sentence, ignore "the recovery of copper from the drainage water of mines" because this portion only severs the purpose of describing "Leaching" Thus A is saying:

• "Leaching as a method of the extraction, it was well established in the 18th, but until recently minors did not realize x"

The main clause is lacking a Verb; hence A is a fragment and cannot be correct. B commits the same error by the way.

Hope that helps,
-Patrick

Thanks Patrick ..OA is "C"

FightWithGMAT wrote:

SmarpanGamt wrote:

Patrick_GMATFix wrote:

SmarpanGamt wrote:Please explain for option( A)

Hello SmarpanGamt,

(A) is incorrect because it's a sentence fragment. To better analyze the sentence, ignore "the recovery of copper from the drainage water of mines" because this portion only severs the purpose of describing "Leaching" Thus A is saying:

• "Leaching as a method of the extraction, it was well established in the 18th, but until recently minors did not realize x"

The main clause is lacking a Verb; hence A is a fragment and cannot be correct. B commits the same error by the way.

Hope that helps,
-Patrick

Thanks Patrick ..OA is "C"

Dear Patrick

If you read the impluse " it cleary says about leaching was the process till 18th century" Only 25 years back bacteria in the process was identified.

Plz correct if the explain is confusing



Could somebody explain why the usage of HAD is wrong in this sentence.
Because we have mentioned dates that makes the time line clear. Is it a general rule when we mentioned dates or time frame, we need not to have HAD in the sentence to make the time of the actions clear.

Please help on this.

tomada wrote:Nothing in the original sentence states or implies that leaching is no longer used as a method of mineral extraction.
On the contrary, leaching was well-established as early as the 18th century (again, nothing here indicates that it was no longer used after the early 18th century). 25 years ago, miners learned that bacteria plays a role in the leaching process. This doesn't mean that leaching hasn't been used in the past 25 years. It only means that miners learned something new about leaching.

tomada wrote:Nothing in the original sentence states or implies that leaching is no longer used as a method of mineral extraction.
On the contrary, leaching was well-established as early as the 18th century (again, nothing here indicates that it was no longer used after the early 18th century). 25 years ago, miners learned that bacteria plays a role in the leaching process. This doesn't mean that leaching hasn't been used in the past 25 years. It only means that miners learned something new about leaching.

tomada wrote:Nothing in the original sentence states or implies that leaching is no longer used as a method of mineral extraction.
On the contrary, leaching was well-established as early as the 18th century (again, nothing here indicates that it was no longer used after the early 18th century). 25 years ago, miners learned that bacteria plays a role in the leaching process. This doesn't mean that leaching hasn't been used in the past 25 years. It only means that miners learned something new about leaching.