Just to bring to your attention incase already not considered. $/ct is $USD/ct.
Also to possibly answer your question re why currently still sitting on AUD$68m MC, because of same reason it was only sitting on sub $40m MC weeks ago... Markets namely ASX are relatively slow, sluggish and couldn't price a bag of apples with a price tag on it.
MUS Price at posting:
11.0¢ Sentiment: Hold Disclosure: Held