Utilize the input text as a context reference, choose the right relationship between shaft sinking and shaft from the options. Options: product/material produced, manufacturer, distributed by, industry, position held, original broadcaster, owned by, founded by, distribution format, headquarters location, stock exchange, currency, parent organization, chief executive officer, director/manager, owner of, operator, member of, employer, chairperson, platform, subsidiary, legal form, publisher, developer, brand, business division, location of formation, creator.

We were impacted with our shaft sinking because the Canadian, the shaft sinking crew was Canadian.

Answer: product_or_material_produced