Two diggers on Blackman's Lead quickly took 690oz from their claim. Taking another claim, they found a great pear shaped nugget more than 11lb in weight, valued at £400. The length of the leads was eight miles. Where Blackman's Lead and Main Lead joined the yield was poorer than where they were separate. In June, 1855, at a depth of 5ft in Blackman's Lead, a nugget of 1,034oz was found and sold for £3,250. Another found in January, 1858, in Blackman's at 6ft, weighed 537oz. Source.
I will edit later and mention his name and that of the old book.