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Upcoming Events

Monday, March 26, 2018 at 9:00 AM OSSGA Generic First Line Supervisor Training

OSSGA Office, Mississauga, ON

Thursday, March 29, 2018 at 9:00 AM OSSGA Common Core Surface Miner Training

OSSGA Office, Mississauga

Thursday, April 12, 2018 at 8:30 AM OSSGA Aggregates 101 Training in Sudbury

Holiday Inn Sudbury Hotel

Saturday, April 14, 2018 at 8:30 AM OSSGA Spring Tune-up: Operations, Safety & Service Training

Thorold, Ontario

Thursday, May 3, 2018 at 8:30 AM OSSGA Quality Control Training

Lafarge Dundas, Only 12 spots available

The Hole Story

Our Organizational Structure

The Ontario Stone, Sand & Gravel Association is directed by elected Officers and a Board of Directors. Association committees, comprised of volunteers, complement the services provided to the membership. The CEO and staff handle the routine business affairs of the Association and regularly report to the Board.


  • Chair of the Board: Bill Marquardt, CBM Aggregates
  • Vice Chair of the Board: Quinn Moyer, Nelson Aggregate Co.
  • Secretary: Mark Geens, Lafarge Holcim Canada Inc.
  • Treasurer: George Lourenco, Capital Paving
  • Immediate Past Chair of the Board: Dan O'Hara, Dufferin Aggregates, a Division of CRH Canada Group Inc.
  • Executive Director:  Norman Cheesman  (Ex Officio Board Member)


Active Directors  

  • Scott Berquist, R.W. Tomlinson
  • David Hanratty, CBM Aggregates
  • Bill Kester, Summit Aggregates
  • Ryan Wall, Walker Industries
  • Scott Boyle, Miller Group
  • Richard Erdmann, Dufferin Aggregates, a Division of CRH Canada Group Inc.
  • Frank Kielbowich, Walker Industries
  • John Mackay, Aecon Construction & Materials
  • Ron Brent, Brent Quarries


Associate Directors

  • David White, Devry Smith Frank LLP
  • Heather Melcher, Golder Associates Ltd.
  • Darrin Rousselle, Kal Tire
  • Jim Thornton, Toromont CAT
  • Angelo Muscillo, Bulk Transfer Systems (ex-officio)

Active Past Chairs

  • Ryan Essex (2013), Miller Paving
  • Malcolm Croskery (2014), Pioneer Construction
  • James Gordon (2015), Fowler Construction
  • Steve Bisson (2016), Nelson Aggregate Co.