The Blackjack Gulch placer occurrence is located along the Manson River approximately 9 kilometres south-southwest of the settlement of Manson Creek. This location of this placer drainage is ambiguous in historic literature and for this occurrence is considered to be the upper parts of the Manson River and all the tributaries above the informally named Kildare Creek (093N 057).

Gold was first discovered along the Manson River in 1871. The old road which was the original route into this area lies approximately 4 kilometres to the west of the plotted location. A rough road still follows the Manson River on the east side of the river.

The entire length of Blackjack Gulch (upper Manson River) is reported to have been worked with fair results. The workings are continuous along a narrow zone that weaves in and out of the present channel and appears to indicate a zone of continuous auriferous gravels.

Gold production from Blackjack Gulch is recorded for the years between 1881 and 1890, totalling 16701 grams; and the years between 1926 and 1945, totalling 9206 grams (Bulletin 28, page 43,44). The total recorded production is 25907 grams of gold.