The Eagle Creek showing is located on the Opal 2 claim about 6.5 kilometres west of Burns Lake.
The area is designated as a No Staking Reserve and is accessed by a well-kept walking trail about 4.2 kilometres in length. Walking time to the collecting area is abouot 1.5 hours each way.
The area is underlain by volcanic rocks of the Oligocene to Miocene Endako Group and the Lower Jurassic Hazelton Group.
The showing is underlain by flat-lying vesicular to amygdaloidal basalts of the Endako Group.
Elongated (up to 7.5 centimetres) and rounded leaf green agates occur in vesicles within the basalt. White and amber agates (up to 5 centimetres in diameter) and rare opals, including fire opals, have been reported. Two pieces of precious opal were found along Eagle Creek. Common opal and agate are plentiful.