What is "treloobing"

Tossing \Toss"ing\, n.

1. The act of throwing upward; a rising and falling suddenly; a rolling and tumbling.

2. (Mining)

   1. A process which consists in washing ores by violent agitation in water, in order to separate the lighter or earthy particles; -- called also tozing, and treloobing, in Cornwall.
      --Pryce.

   2. A process for refining tin by dropping it through the air while melted.