O'Brien Mine - Grenfell

Gold was discovered on this hill by Cornelius O'Brien who was a shepherd in the employ of J.B. Wood of Brundah-Run. He registered his claim at young on the 2nd October 1866. Which commenced a full scale rush of thousands of minders into the area.
O'Briens reef was one and three quarters of a mile (2.8km) long and from five to twenty chains (100n to 400m) in width. This mine was worked to a depth of 750 feet (230m) and was the deepest in the colony at the time.

O'Brien Mine - Grenfell O'Brien Mine - Grenfell O'Brien Mine - Grenfell O'Brien Mine - Grenfell

The o'Brien claim was the richest claim on the field. Total yeld was $741000 worth of gold at 8 to 26oz. The peak of production for the field was in 1868 when 45313oz was mined in the first three years 129207oz. was recoverd. This was more than 60% of the Grenfell Field.
During the Grenfells mining era in excess of $3000000 worth of gold was recovered by 1871. The Bonanza was ofer and many miners left for other fields. Many remained and turned their attention to gold of another kind the gilden soil.

O'Brien Mine - Grenfell O'Brien Mine - Grenfell O'Brien Mine - Grenfell O'Brien Mine - Grenfell

Source: on site information board