DCHP-1 Online
skim diggings Placer Mining 
See 1913 quote.
- 1897 There was a general fear that these might be only "skim diggins."
- 1913 . . . all mining done in the territory was on the bars and banks of the streams, and most of this was known as skim diggings, that is, only the two to four feet of the surface was worked. . . .
- 1897 There was a general fear that these might be only "skim diggins."