March 2015:  Press Release for upcoming Apr 11, 12 Weekend Mariposa Gem Show. Read the final news release here. For more background info on the various parties behind the show, read our Backgrounder.

April 2014:  Press Release for upcoming Easter Weekend Mariposa Gem Show. Read the news release here, or download a .pdf version here.

Sept 2013:  Next year’s Gem and Mineral Show is confirmed for April 19 and 20th, Easter weekend. Ever bigger and better, our them will be Magic of Minerals. Call the museum to reserve a booth space, or watch this site for forms.

July 2013:  The vault is now open with a total of 9 display cases.

Jan 2013:  Call for Exhibiting Vendors. Read Press Release.


Nov 26:  Email from Gem and Mineral club calling for exhibitors. See Home Page.

Apr 3: The Merced Sun Star recently wrote a great article about us, even though they did manage to get the wrong pictures. See Outdoors: Mariposa Mining Museum a Treasure.

Apr 8:  Huffington Post reports that 11 State Parks have already reached deals to stay open thanks to active volunteer programs. And 24 more are in early stage negotiations – that includes CSMMM! The article even calls out some of our collection. See California State Park Closures: Packing Artifacts May Reduce Savings

Apr 9: Mariposa Gem and Mineral show this coming weekend.



Randy Bolt
April 1, 2012 (209) 742-7625

MARIPOSA- A variety of beautiful minerals and rocks will slide into the fairgrounds as the Mariposa Mineral & Gem Show, “Mountains of Minerals” returns on Saturday April 14th and Sunday April 15th. Our 12th annual show will take place at the Mariposa County Fairgrounds, on historic Highway 49, two miles south of the town of Mariposa, or 30 min. North of Oakhurst. Admission and parking are FREE!

Show hours are Saturday 10:00 – 6:00 and Sunday 10:00 – 4:00

A wide variety of gemstone jewelry and rough, breathtaking mineral and rock specimens, fossils, crystals, beads and mineral related crafts of all sorts will be available from our many vendors.  World class gold and rare gemstones are on display in the California State Mining & Mineral Museum which resides at the fairgrounds year round.  This could be your last chance to see the Museum if we are forced to close and move this June.

California State Parks will offer a variety of children’s activities at the show.   In addition to viewing the spectacular California State Mineral Collection, kids can go on a scavenger hunt in the museum, and explore rocks and mineral crystals at the touch table. All activities and demos are free. 

Several guest speakers and demonstrations are also on the schedule.  Saturday at 11:00 Robin Williams will offer a Geology program for kids showing how rocks are made.  Saturday at 2:00, Jim Pisani, of the American Opal Society, will tell us about California’s Jade, and its imposters.   On Sunday at 11:00am local prospector and owner of Gold Rush Trading Post, Fred Radonic will show us the basics of using metal detectors.  Sunday at 2:00 local artist Gerry Cross will have a beaded jewelry demonstration.  Saturday and Sunday throughout the day Museum docents will demonstrate gold rush mining methods.  See the tools and methods used by the 49ers to survive and find gold.

The Museum Association is sponsoring a silent auction of jewelry, rocks, and minerals.  Geode cutting is back again by popular demand, and you will find many unique jewelry items handcrafted by local member artists, at the Mariposa Gem & Mineral Club booth.  Local vendors will also be available with a variety of food items.

For information call:   209-742-7625