Hello,
Do you have any information about this “mint”?
All I could find is: https://silverartcollector.com/item/death-valley-mint/love-ishelping-each-other-get-up-in-the-morning/ussc-274/
where it states that the bar was made by USSC (I assume it means United States Silver Company).
I'm wondering whether Death Valley Mint could be a company ordering the production of the bars and distributing them, but not manufacturing themselves. In that case, it should be listed as “issuing entity” on Numista, not as a mint.