The
processing of a crystalline silica substance is
"high risk" if the processing of the substance at a workplace—
(a) is determined, under section 529CA (1) , to be reasonably likely to result in a risk to the health of a person at the workplace; or
(b) is taken, under section 529CA (5) , to be reasonably likely to result in a risk to the health of a person at the workplace.