Government of Canada, department of public safety published this document. 

Guidance on Essential Services and Functions in Canada During the COVID-19 Pandemic

It's lengthy but I thought this part indicates just how important mining is and where it sits in the scheme of things: 

• Workers in mining and forestry, including workers on abandoned mines
• Businesses that ensure global continuity of supply of mining and mineral materials and products, and that support supply chains in Canada, including: mining operations (mines and quarries) and metallurgical operations (smelters, refiners and recyclers); mineral exploration and development; mining supply and services that support supply chains in the mining industry including maintenance of operations, health and safety

Tequila Rose