The 409-acre community of Stonecrest in east Canyon Country will become part of the city of Santa Clarita. The Los Angeles County Local Agency Formation Commission on Wednesday approved the annexation of the property. The neighborhood, which has 1,147 registered voters, sits within a mile of the proposed Cemex sand and gravel mine, which Santa Clarita wants to regulate. A total of 95 out of 662 landowners protested the change, according to the commission. The modification now must be filed with the Registrar-Recorder/County Clerk. It is the 28th time Santa Clarita has expanded its borders since incorporation in 1987.