Not that coal disappeared shortly after 1915. It was going relatively strong until the mid 60s and dropped to 1/3 of the peak in the 80s. In terms of production tonnage
Yes. To be very clear, due to technological improvements allowing better eROI and better access to resources that couldn't be exploited previously, a "peak" isn't catastrophic: the production just become flat and sightly down as the best mines empty out. But having to import energy sources from outside your country is a good way to limit your industry growth.