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Restoration of Lost Corners by Proportionate Measurement
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  Section 1- Fundamental Background Information

A 1909 Act of Congress allows the BLM involvement where the area under consideration is largely owned by the public especially where extensive obliteration has occurred. In 1918, another congressional act went even further, permitting BLM to conduct resurveys even if the public lands represent less than half of the involved area. This act also requires that private land owners bear their proportionate share of the cost of such resurveying in their area.

Also, many present, private lands were patented from the Federal Government with mineral reservations. Federal surveyors may be called upon to survey these lands. In all cases, it is required that no resurvey shall impair, or diminish the bona fide rights of any claimant. That is, rights acquired in good faith under the law. To guarantee that any BLM survey will justly reflect the intentions of an honestly executed original survey, the Bureau applies the techniques of proportionate measurement to restore any truly lost corner. Before we assume any corner is lost, we must do all in our power to be certain that the original corner location is not merely hard to find.

Fortunately, the process of performing a corner search also uses the logic of proportionate measurement. Before we go into the various methods of calculating proportionate measurement, let's review some terms you will see and hear throughout this program and daily in cadastral survey work. The use of the term, "half mile" in reference to north and south, or east and west segments of the line are not meant to imply that the halves are truly half miles. These halves were established as half miles during the original survey, but may be considerably shorter, or longer than what was originally intended. However, they are still represented as half miles.

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