This collection consists of technical plans and details of the Deloro mining processes, labour relations and union papers, medical information concerning arsenic poisoning, historical material regarding Deloro and the village of Marmora, maps, and plant photographs, layouts, and site plans.

Fonds consists of family and business records pertaining to Howard Borden Hamilton and his company, "Howard Hamilton", later known as "Hamilton Holiday Homes", located in McCracken's Landing, Ontario.

Included in Box 1 are company financial records, wage records, time logs, inventory records, building permits lists, etc. (1937-1981).

Included in Box 2 are business receipts (1979-1981); George Wade bills, etc. (1961-1962); deeds and property documents (1937-1974); Gwendolen Hanley documents relating to various shares, and to the Parkside Motel, Otonabee Township, Ontario, and Forest Plaza Hotel, Mount Forest, Ontario (1963-1972); and Herczeg, Perlus, and Okany building plans (1971).

Also included are miscellaneous family records, and a folder of local business receipts issued to William Crowe of Stoney Lake, Ontario, and Jordon Crowe (1883-1924), a "Pathmasters" list, and "Heart Receipt", a recipe for heart ailments.

Located in the Large Materials Cabinet are building plans for cottages, homes, and decks at properties belonging to [Keith McKerracher] (1965), Order of the Eastern Star (1972), Clementi Lodge House, Lakefield (1973), D. Bell (1976), Domal-Marine Div. (1980), Marvin McDermot (1982), and J. Webster (1982).