Shipper is required to supply HazMat placards, driver is required to verify placards are correct and installed, often that means installing them.
You’re good to go if that’s the lead you are talking about. You can put them with anything but open food products. Sealed medical supplies won’t be harmed unless you get into an accident. wondering how many you have in the picture and how much each ingot or pig weighs? i hauls zinc for a few years and the ingots close to that size were between 4500 and 5000 pounds each.