We like Kensington Are hosting on the property a mesothermal veining structure. They have been known too go as deep as:
https://investingnews.com/daily/resource-investing/precious-metals-investing/gold-investing/mesothermal-vein-gold-deposits/
This below gives us an idea of how deep but this clip is from Oct . 2017. Also look too see they use sea level in their elevations, gotta figure how far they are above sea level. But I look at the drilling records for each hole for that.
Several holes such as 17L-3, 17U-1, and 17Y-1 & 2, were designed to test two major veins each. Three of the holes tested the Deep Trench vein much deeper than any previous drilling with very good visual results. Hole 17Y-2 hit visible gold in the Deep Trench vein over 300 metres below sea level which is a good indication that strong grades are not limited by depth. Drilling on the Goat vein was designed to extend the known strike length of the mineralization previously drilled from only one pad. Intersections of the vein drilled from pads K and L prove a strike length of at least 300 metres but when combined with rare surface outcrops and topographic features, a length of at least 600 metres is indicated. The deepest drilling on the Goat to date is slightly less than 200 metres.
Ian Klassen, Grande Portage's CEO remarked, "We are delighted with the drilling program this year. For some time, our team has known that the Herbert gold discovery has significant expansion potential and this is evidenced by the fact we continue to intercept gold bearing veins laterally and at depths not encountered before."
The Herbert Gold property is in the historic Juneau Gold Belt, formerly a world class district with producers such the AJ and Treadwell mines and literally dozens of smaller gold mines and prospects. Overall gold production from the district is over 7 million ounces. In 2010, the district was reactivated by the reopening of Coeur Alaska's Kensington gold mine located northwest of the Herbert property and is on track to mine 125,000 ounces Au in each of the next 12+ years. In addition, strong community support has been demonstrated for Hecla Mining Company's polymetallic Green's Creek Mine, a massive sulfide deposit containing silver, gold and zinc located in a parallel trend 20 kilometres to the west.