UNALASKA, AK (KUCB) - The last of the active North Aleutian basin natural leases have been dropped. Hewitt Mineral Corporation let go its four leases in October, two years after Shell relinquished the 33 leases it possessed.  Hewitt's leases covered over 22,000 acres on the Alaska Peninsula. The company had hoped to develop a liquefied natural gas plant on the peninsula as well as a pipeline. But a number of challenges have caused Hewitt to release its stake, says company president William Dolman.  "Shell released theirs a couple of years ago, and [...]