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East of Dryden near Thunder Lake the Trek Corporation discovered a gold deposit in 1989. Trek then optioned it in 1994 to Corona Gold for further testing, since the option agreement the Thunder Lake claim has been the main focus of Corona Gold. There are two deposits of gold, the main zone, which contains 99% of the gold, and the C zone found in 1997 has a deposit 1400m wide by 800m deep. The deposit is estimated to be 2,974,00 tons of 6.47 g/t gold in total with the main zone containing a higher grade of gold than the C zone.
To extract the gold at the Thunder Lake site is complex therefore further examination of the mineralized underground is required to determine the nature and continuity of the materialization and structural control.

Corona Gold Corp. information from Corona Gold Annual Report 1999.

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Although forestry and pulp and paper are Dryden's dominent industries, prospecting and mining still currently continue.