In the high-value trade CGs, estimates of about a quarter of the tonnage not being delivered to the CG itself have seemed fairly consistent with the available data. That would be about 15 million tonnes, and there's no obvious reason why the base CG being a mining CG instead should change that massively.Would be interesting to know how many not mined tritium was sold this week ;-)
15 MT * 150k/T profit would be about 2 trillion credits profit, so if it was something of that scale it should be possible to detect by comparing the trade squadron leaderboards to the long-term trends when the season ends on 6 December. (Obviously not everyone is in a squadron, but still, it should be enough to tell the difference between 15 MT, 1.5 MT and 150 MT)