Production of the even-bedded and compact sandstone suitable for flagging and house trimmings known commercially as bluestone begins on the western side of the Hudson River in the southwestern part of Albany county and stretches southward through Greene, Ulster, Sullivan, Delaware and Broome counties.

Van Bramer Brothers have a large quarry on the property that would come to be known as Opus 40. The quarry bed is eight to nine feet thick, six feet of which are workable stone, with the balance being, to quote the company, “rubbish interbedded with the stone. There is not much variation in the quality of the bed.” Four men are employed during the year, and the only equipment used is a hand derrick.