in Dec 2014 (10+ years ago) they put in place for the 1st time a ceiling that targets halts on silver & gold:
$3+ in silver = 5 min. halt <<<-up to 4 halts in day ($12 max) shuts the market down for the day $100+ in gold = 5 min. halt <<<-up to 4 halts in day ($400 max) shuts the market down for the day
There was NEVER a ceiling halt in place for silver/gold, so obviously, they expected one in the future...interesting it's been 10 years as of Dec 2014 & coincidentally we have gold running like crazy now (silver lagging WAY behind, but will soon be crazy too imo)...stay tuned
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