_Annual Labor, remonumentation and remarking of corners_: Affidavit of labor as required by federal law must be filed within 30 days of the time limit for performance (end of assessment year) and, in addition to the usual statements and descriptions, a statement that all corners and notices are in place and are properly marked; an additional 30 days is allowed for a supplemental affidavit if the original was filed by someone other than the owner. Failure in such case constitutes _prima facie_ presumption of abandonment. _Survey and monumentation_ by a United States Mineral Surveyor or land surveyor licensed in California together with filing of field notes for record with the location notice, constitutes _prima facie_ evidence of the facts therein. _Penalties_ are provided for false statements and removal or destruction of monuments. _Location (Discovery) Work_: None required (law amended in 1965 for placers, 1972 for lodes), except in the case of a tunnel right. _Survey of Location_: United States Mineral Surveyors are permitted to make and record location surveys. 1–32 COLORADO Lode Claims: _Location notice_ or plain sign to be posted at the point of discovery on the surface containing name of the lode (claim), name of locator(s), and date of discovery. _Discovery (Location) Work_ in the form of a shaft ten feet deep or deeper if necessary for discovery, or open cut, crosscut or tunnel which cuts a lode ten feet beneath the surface, or adit at least ten feet in along lode from point of discovery to be completed within 60 days from date of discovery, or file a map with the location certificate based on an actual ground survey (see below). _Monumentation_: Surface boundaries to be marked by six substantial posts, hewed or marked on the sides facing the claim, set in the ground (or in a mound of stones on bedrock) one at each corner and one at the center of each side line. Witness corner, suitably marked, may be used as necessary. _Recording_: Within three months from date of discovery, file with the county recorder a location certificate containing the name of the lode (claim), name of locator(s), date of location, the number of lineal feet claimed on each side of discovery shaft (similar working as provided above, or discovery point), the general course of the lode and such description as shall identify the claim with reasonable certainty. _Field Survey and Map_: In lieu of a discovery shaft (or similar working) and within the time required for filing the location certificate, attach to the location certificate for recording a map at a scale of 1″ = 500′ prepared from an actual ground survey showing the name and address of the discoverer of the claim, the legal subdivision upon which the claim is located if on surveyed land, courses and distances of the boundaries with tie to the nearest section or quarter section corner or permanent monument if on unsurveyed land, thus readily identifying the claim. Placer Claim: