The first goldfields were alluvial or surface goldfields, where the gold could be washed or winnowed from the soil. The life of these goldfields was short. In Victoria in 1852, it was estimated that the value of gold found by diggers was an average of 324 oz per head. By 1856 it had fallen to 103 oz and it further declined to 78 oz in 1865. In Victoria in 1856, there were 115 000 prospectors (or alluvial diggers.) By 1865, the number had declined to 80 000.