I recently photographed this cross in the "Miners Cemetery" near Galena, Illinois. I'm hoping someone here can tell me the significance of "Ihs?" I think the cross is really beautiful....
Please do consider memorializing these miners. Wonderful that you have documentation! I hope that my efforts regarding the Caribou Cemetery will inspire you and others. My colleagues and I are literally waiting for snow to melt (cemetery at 10,000 feet), but we have partnered with a local historical society so that donations are tax-deductible. And, I have also created our website, cariboucemetery.com -- all to create awareness. You can certainly do the same in your community. In your case, you could even place individual markers, but you could also create one large interpretive sign with a "map" to show (and identify) the graves. If, through the CAHS I start a Special Interest Group on Cornish (and predominately Cornish) cemeteries, your cemetery should be included.
Using Biblical Greek, it's a monogram, of sorts, for Jesus Christ. https://simple.m.wikipedia.org/wiki/Christogram_IHS