According to the Canada Revenue Agency (CRA), Cryptocurrency mining can be considered a business activity, meaning it would be seen as income under a business. However, the income tax treatment for Cryptocurrency miners is different depending on whether your mining activities are a personal activity (a hobby) or a business activity. This is decided on a case-by-case basis.
Considering you only have a few pieces of equipment, and that the Canada Revenue Agency (CRA) understands that the personal/business activity decision is a subjective matter, you are okay to not report this as long as it's a hobby for you. I would start to report income the moment you are upgrading your equipment, buying more pieces and reinvesting back into the operation. This would be considered more towards business than a hobby at that point.
For more information, check out: Canada Revenue Agency (CRA) - Mining Crypto
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