The blow off top of 257c was created by some market participants...

The blow off top of 257c was created by some market participants gross over enthusiasm - it was a transient market valuation - a lot of gold miners SP peaked in this period when the POG was high - after the POG retraced, a lot of these SP peaks quickly retreated.
Selling begets more selling - and the over reaction can be extreme - "over sold" ... look at how NST and RMS SP got trashed similarly after the 2020 highs. RMS got dropped from several gold indexes and this accentuated ist SP fall ... its chart looks almost identical to SLR's
( in fact, back then there was a ridiculous HC dialogue debating the respective merits of SLR vs RMS on both the SLR and RMS HC blogs )

BUT, these companies recovered through a combination of good management and a recovery in gold price sentiment. Ditto SLR.
SLR SP recovered from a low 81c to peak above 150c before trading in SLR ceased ... so, you say current SLR valuation is 140c which is almost double SLR's nadir. If people don't fairly compare companies performances and the influences that the fluctuating market sentiments play, what can one say ?
If SLR traders had a "trailing stop loss" strategy in place, then once SLR's SP retreated below 250 or 240 or 230 or 200c, then they could of re-entered at 100c or less and be laughing all the way to the proverbial bank .... don't blame others for ones own poor trading performance.