You need 2 sectors + 12k miles (or 0 sectors + 35k miles) to get Silver
THEN
You need 4 sectors + 24k miles to qualify for Gold (or 0 sectors and 70k miles)
You then need 12k miles and 4 sectors to maintain gold.
So to answer your question - no, if you start out as a blue member, 30k miles + 4 sectors will NOT get you gold.