You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "Which mine was in production longer, Beaulieu Mine or Ptarmigan and Tom Mine?" whose answer is Ptarmigan and Tom Mine.
Each document should contain about 30 words, and these documents should contain useful information.

Query: Ptarmigan and Tom Mine production period
Useful Output:

Doc 1: Ptarmigan Mine and Tom Mine are former gold exploration sites, located on the Ingraham Trail, 15 kilometers northeast of Yellowknife.
Doc 2: Ptarmigan was a gold mine in the 1940s, 1980s, and 1990s. The Ingraham Trail highway runs between the mine and one of its tailings ponds.
Doc 3: It resumed again in the 1980's and continued until 1997. During the ten years it was in operation, the mine produced around 75,000 ounces of
Doc 4: The Tom Mine was a gold producer in the Yellowknife gold district from 1985-1997. The Tom and C vein systems were accessed by ramp to 122
Doc 5: The Ptarmigan Mine and Upper/East Ptarmigan are interpreted to host silver- and gold- bearing, pyrite mineralized sulphide bodies.