It said the inaugural channel sample cut on the discovery outcrop assayed 8.4m at 7.37g/t gold-equivalent, including 3.4m at 17.68g/t and 0.4m at 102.16g/t.
Chip samples from Sure Bet included 1m grading 49.5g/t gold, 862g/t silver, 0.06% copper, 1.71% zinc and 6.07% lead, or 63.3g/t gold-equivalent.
Goliath said Sure Bet was discovered during a "brief reconnaissance field programme" following up on targets generated from Lidar and geochemical data, in an area exposed by recent glacial and snow pack abatement.
"We are extremely excited with this very material and original discovery on our 100% controlled Golddigger property," president, director and CEO Roger Rosmus said.
"The Sure Bet zone is in close proximity to infrastructure and located in a world-class geologic setting in the Golden Triangle along the Red Line Corridor."
Goliath said it also planned to release drilling results from its recent Lorne Creek porphyry discovery at its Lucky Strike property in BC this month.
The company had C$1.69 million (US$1.3 million) in working capital at May 31, after raising about $450,000 that month in the first tranche of a placement at 10c per flow-through unit and 9c per unit.
Goliath shares rose from 5.5c to 14.5c in August.
They closed down 0.5c or 6.2% yesterday to 7.5c, capitalising it at $8.3 million (US$6.3 million).