Potosi Mine may be the site of the oldest lode mine in Nevada. The mine and camp was discovered in 1847. Very little mining took place until 1861 when serious mining began and the town of Potosi came into being. A camp of 100 formed, but mining ceased in 1863. The mine sat idle until 1906 when zinc mining began. During ensuing years, Potosi was Nevada's largest producer.
The photos here are of the old mine foundations. I have not hiked up to the actual mine, which I understand is posted.