Gold production (1905-1920) totalling 275,919 grams is recorded for Boulder Creek, which flows south into Thibert Creek, located about 8 kilometres west of the north end of Dease Lake.
The creek drains an area underlain by greywacke, slate and chert of the Mississippian-Triassic Kedahda Formation (Cache Creek Complex). Proven, probable and possible reserves are 841,060 cubic metres grading 1.3 grams per tonne (George Cross News Letter No.139 (July 21), 1986).
In 2000, Netseers Internet Corp. attempted to find the source of the Thibert Creek placers and possibly the Keystone showing (104J 012). The company completed detailed mapping and sampling of the placer workings at Delure Creek (104J 055), Five Mile Gulch, Boulder Creek and Berry Creek (104J 007) with the attempt to locate possible sources of gold mineralization within the workings. A total of 90 soil samples were taken in a total of eleven lines which were intended to bracket the areas of the workings and locate possible sources of mineralization.