" It was my understanding that ALL US oil trusts have finite lives"
Q&A from HGT website:
Is there an end date to the trust?/How will the trust end?
The Trust does not have a specific end date. There are, however, some events that could cause the Trust to terminate:
If the Royalties fail to generate net revenue for the Trust of at least $1,000,000 per year over any consecutive two year period,
A unitholder vote of 75% or more.