Meanings of successful digger in English

A successful digger would drink off a dozen one after another.

He was dressed after the manner of a successful digger, with a touch of vanity.

Subsequently I met with a successful digger, who told me a good deal about the diamond-fields.

But I was never a successful digger.

I expect he's only a successful digger.

Thus, a successful digger wishing to invest his "pile" was often the prey of the first specious rogue he met.

Our timely friends were a party of successful diggers returning, from work.

But he and mephistopheles joined a company of successful diggers going down with their swag.

Several successful diggers were murdered for the sake of their wealth, and others were cut off by Indians, while prospecting beyond the chief diggings.