Mr. Ryzak attended Michigan Technological University from 1964 to 1969, where he studied mine development and production geology, receiving a Bachelor of Science degree in Geology.
He was employed as a development, production and underground mine geologist at the Lakeshore Copper Mine in Arizona for Hecla Mining Company from 1969 to 1978. The Lakeshore Mine, a disseminated porphyry copper deposit with a higher grade tactite at the base, was put into production during the 1970′s.
From 1978 through mid 1982, Mr. Ryzak was employed by Cobb Resources as the mine development geologist at their underground uranium mine in the Ambrosia Lake Uranium District north of Grants, New Mexico.
From 1982 to 1983, Mr. Ryzak worked as a development and underground mine geologist for Cobb Resources at the London Mine (gold) located near Fairplay, Colorado.
Early in 1984, he was employed by C&S Resources as a contract geologist. C&S Resources was reopening an underground silver mine at Gold Point, Nevada.
From 1984 to 1990, Mr. Ryzak worked for Pegasus Gold Corporation as a developmental and production geologist at their Zortman and Landusky mining operations located at Zortman, Montana. Pegasus at this time was developing some of the early large scale open pit gold producers in the United States. While at the Zortman and Landusky mine David assisted in defining tens of millions of tons of low grade gold ore which formed the basis of the reserves mined from this deposit from 1984 through the mid 1990′s.
Pegasus Gold transferred Mr. Ryzak to the new Black Pine Mine, located southeast of Burley, Idaho where he was the Senior Geologist from 1990 to 1997 concentrating his efforts in reserve development and production. His work in developing low grade gold resources into reserves extended the life of the mine over two years beyond the initial projections.
From 1999 to 2000 David was employed to investigate and write geological reports and reclamation permits for American Stone in the development of building stone quarries in Utah and Idaho.
From 2000 through the present Mr. Ryzak has worked as a geological consultant providing geological reports, mine economic evaluations, mine and reclamation permitting for his clients.