"Plan of Gatling Co.'s Gold Mining Property and adjoining lots, Marmora, County of Hastings, Ontario." Scale: 1:3000. Published by The Desbarats Lith. and Comp. Montreal.
Donated by the Col. W. N. Ponton Estate. Col. Ponton or a relation presumably made the additional pen-written notes on the map.
Gatling Company owned the Gatling and Tuttle shafts at the Delora Mine, which were first opened by the Gatling Gold and Silver Mining company in 1873.
Read more: http://www.marmorahistory.ca/1866-founding-of-deloro