This makes sense. If you had a mining claim that was abandoned, ownership would revert to the government. You still have two APN's in one section, but the owner would be the same owner for both APN's.
Some basic fun facts about land surveying:
A chain is 66 feet long.
A section is 5,280 feet (one mile) on each side.
Therefore the four sides of a section are each 80 chains long.
An acre is 10 square chains.
There are (usually) 640 acres per section. Note that Section 27, directly east of Section 28, is 681 acres (for reasons unknown).
And yes they used real chains to measure this stuff. Thus a chain was not only a unit of measure (66 feet) but also a physical object made of metal.
More at:
http://www.blm.gov/or/landrecords/legaldescrip.php
http://websterassessor.org/PageDisplay.asp?p1=2296
HJ
