Rancho Carbonera was a 2,225-acre (9.00 km2) Mexican land grant in present day Santa Cruz County, California given in 1838 by Governor Juan B. Alvarado to William Buckle (Bocle). The grant was north of present day Santa Cruz between the San Lorenzo River and Branciforte Creek. The southern section of Henry Cowell Redwoods State Park is within the Rancho.
The Englishman William Buckle (1803–1859), captain of the whaler "Daniel" in Hawaii, came to California in 1823. He moved with his brother, Samuel Buckle (1795–1872), to Branciforte. He married Maria Antonia Castro. He was naturalized as Jose Guillermo Bocle, but had many aliases - Bocle, Boc, Bocle, Bucle, Thompson, and Mead were a few names he used. William Bocle claimed one-half square league Rancho Carbonero in 1838 and built a sawmill there. William and his brother, Samuel, changed their names to Thompson. He was one of the foreigners arrested in the 1840 Graham affair.
With the cession of California to the United States following the Mexican-American War, the 1848 Treaty of Guadalupe Hidalgo provided that the land grants would be honored. As required by the Land Act of 1851, a claim for Rancho Carbonera was filed with the Public Land Commission in 1852, and the grant was patented to William Buckle in 1873.
- Ogden Hoffman, 1862, Reports of Land Cases Determined in the United States District Court for the Northern District of California, Numa Hubert, San Francisco
- Hoover, Mildred B.; Hero & Ethel Rensch, and William N. Abeloe (1966). Historic Spots in California. Stanford University Press. ISBN 978-0-8047-4482-9.
- Rancho Carbonera
- United States. District Court (California : Northern District) Land Case 255 ND
- Report of the Surveyor General 1844 - 1886
- Davis v. California Powder Works, 1890, Reports of Cases determined in the Supreme Court of the State of California, 84 Cal. 617, Volume 84, pp.617-634 , Bancroft-Whitney Company
- California Powder Works v. Davis, U.S. Supreme Court, 151 U.S. 389 (1894)