Depends on the state - but, here is Nevada's
MARKING BOUNDARIES
Nevada State law (NRS 517.030) requires that the locator must define the boundaries
of the lode claim by placing a monument at each corner within 60 days from the date
of location (fig. 1). If the side lines are not straight, a monument should be placed at
each bend. Boundary monuments can be placed on ground already claimed, but the
location monument and the discovery must be on ground open to location (fig. 2).
According to Nevada State law (NRS 517.030) the monuments may consist of
any of the following:
A. a blazed and marked tree, with top removed and minimum diameter of at
least 4 inches, protruding at least 3 feet above the ground;
B. a rock in place capped by smaller rocks to a total height of at least 3 feet;
C. a wooden post at least 1 by 1 inches square or a metal post (securely
capped if hollow) at least 2 inches in diameter; the wooden post or metal
pipe must be at least 4 feet long set 1 foot into the ground or, if digging a
hole is impractical, placed in a mound of earth or rocks;
D. a stone (not a rock in place) at least 6 inches in diameter and 18 inches long
with two-thirds of its length set in a mound of earth or rock 3 feet in diameter
and 2 feet high; or
E. a durable plastic pipe if it was set before March 16, 1993, provided that it is at
least 3 inches in diameter, 4 feet long, set 1 foot into the ground, and is
securely capped with no open perforations.
AND
MARKING BOUNDARIES
If the placer claim is located according to legal land subdivision, the location
monument is the only monument required (43 CFR 3831.1; NRS 517.090). If the
claim is not located in this manner, Nevada law (NRS 517.090) states only that the
marking of the boundaries and the location point be done in the same manner and
by the same means as required for marking boundaries of a lode claim (see section
on locating a lode claim; marking boundaries). Erection and marking of monuments
at all corners or bends of the placer claim is recommended. The monuments must
placed within 60 days after the date of location
Now, more has been added since this booklet - but, I guarantee - California counties almost all have boundary marker requirements.
But - It is a fact that keeping them up is a full-time job. And many "nature and environmental" groups DO make it a habit to take down discovery markers, as well as corner boundary markers - especially on lodes, for some reason, and the main discovery markers on placers. That's why it is important to file it with your county just as soon as you first put them up, and, if you are anything like us - take a picture (with the date on it) when you do it. It came in real handy when someone cross-filed on one of our claims.
Beth
Posted on: April 20, 2012, 01:59:11 AM
Oops, forgot to add California's - It is for lodes and placers
(b) By marking the boundaries so that they may be readily traced
and by erecting at each corner of the claim, or at the nearest
accessible points thereto, a conspicuous and substantial monument.
Each corner monument shall bear or contain markings sufficient to
appropriately designate the corner of the mining claim to which it
pertains and the name of the claim. - the idea being, very specifically, that the lines of a claim has to be readily traceable.
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