The Casa Grande has rooms full of period furnishings as well as the Quicksilver Mining Museum.
New Almaden cinnabar is notable for its tiny crystals that give the ore a glittering appearance.
Mount Hamilton’s observatories stand out beyond the lower Santa Teresa Hills, site of more mercury mines and sandstone quarries.
View west from Almaden Quicksilver County Park toward Loma Prieta, highest peak of the Sierra Azul. All photos by Andrew Alden.
The Buena Vista shaft mainly served to dewater the hills and allow neighboring mines to go deeper in search of cinnabar.
The New Almaden district runs northwest on Los Capitancillos Ridge from the village of New Almaden. Asterisks mark the four park entrances. Franciscan rock units are fm, melange; fpv, volcanics; gs, greenstone; pink, serpentinite; yellow, silica-carbonate rock; orange, chert. Units with names starting Q, T or K are younger.