E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Come to my diggings. To my rooms, residence, office, sanctum. A word imported from California and its gold diggings.
My friend here wants to take diggings; and as you were complaining that you would get someone to go halves with you, I thought I had better bring you together.A. O. Doyle: A Study in Scarlet, chap. i.