MCL will float in this first quarter of 2018. Up until then, the...

MCL will float in this first quarter of 2018. Up until then, the value of QBL attributed to the 55% ownership of an unlisted company is vague, and based on investor's sentiments regarding the future potential of MCL.
After the float, there is a definite value or market cap placed on MCL and the value of QBL will change in correlation with change of value of MCL. However the % change in SP of QBL will be a bit lower as it is a 55% interest. It is definitely worth holding both IMO. Then there is the Bauxite potential, which is not fully priced in yet to the SP of QBL. I don't believe you have much downside. But, this is the speculative end of the market. DYOR and take full responsibility for investing your own money.