From this, it’s about 400m down, little over 1300 feet.
From the linked article:
Canada Silver Cobalt Works released the first-ever resource in the Gowganda Camp and greater Cobalt Camp. In May 2020. A total of 7.56 million ounces of silver in Inferred resources comprising very high-grade silver (8,582grams per tonne un-cut or 250.2 oz/ton) in 27,400 tonnes of material from two sections (1A and 1B) of the Robinson Zone beginning at a vertical depth of approximately 400 meters. The discovery remains open in all directions (1A and 1B are approximately 800 meters from the east-trending Capitol Mine workings)(mineral resources that are not mineral reserves do not have demonstrated economic viability)