1959 Map of Pebblestone Shut-In

About this map

Mercury mining and rugged coastal range topography define this 1959 survey of the Santa Lucia Mountains. The landscape is marked by numerous extraction sites, including the Almaden Mine and Quien Sabe Mine, centered near the elevated plateaus of Almaden Flats and Marmolejo Flats. These settlements and workings highlight the mid-century industrial presence in this part of San Luis Obispo County before the shift toward conservation. High points like Pine Mtn and the Rocky Butte Lookout provide clear vantage points over a complex network of canyons and watercourses. To the north, the Nacimiento River flows into the Nacimiento Res, while the south is drained by the North Fork San Simeon Creek and South Fork San Simeon Creek. The intricate web of jeep trails and isolated springs suggests a remote working environment for the miners and surveyors of the era.