Conversation so far:
How did Andrew Carnegie's Keystone Bridge Company come about?
The Keystone Bridge Company, founded in 1865 by Andrew Carnegie, was an American bridge building company. It was one of 28 companies absorbed into the American Bridge Company in 1900.
What had Andrew Carnegie been doing previously?
In spring 1861, Andrew Carnegie was appointed by Thomas A. Scott, as Superintendent of the Military Railways and the Union Government's telegraph lines in the East.
What was Story Farm?
The Story Farm consisted of 501 acres, all but 100 acres being on the west side of Oil Creek, Venango County, Pennsylvania. James Story, settled there in the early 1800’s.

Question: How much did they make from the oil?
Self-contained rewrite: How much did Andrew Carnegie's Keystone Bridge Company make from the oil?