RE:RE:Flow Through explainedThe video was 2018. Rules may have been updated as this tax site says "usually two years".
https://www.taxtips.ca/personaltax/investing/taxtreatment/flowthroughshares.htm
Tax Treatment of Income From Investments in Flow-Through Shares (FTSs)
Income Tax Act s. 66(12.6)-(12.75), 66.3(3)
This information is regarding investments which are held outside of RRSPs or other registered accounts.
Flow-through shares are considered to be a speculative investment. Before purchasing, make sure you are aware of how long you will have to hold them before you can sell (usually 2 years), amounts of sales commission, etc. The flow-through shares can be purchased directly from a resource company, or from a limited partnership (LP). The LP then invests in resource companies, which provides the investor some diversification.