The Marmot Pass area is also underlain by the Narchilla formation. The stratigraphy is folded along broad, 100s-of-m-scale southeast trending folds with parallel 10s-of-m-scale folding above the detachment surface, and it is cut by the steeply-northeast-dipping  thrust.

Only minor quartz is present in Marmot Pass. One large outcropping while bull quartz sweat, roughly 2m wide, forms a visible outcrop in the northern tributary drainage to the headwaters of Marmot Creek. This was sampled but found to be barren for gold, as were most other samples in the pass. Impressions of siderite blades in a barren quartz sample and ankerite in a mineralized sample reflect a similar environment to Mars NE.

Gold mineralization was located in a float specimen and in subcrop in Marmot Pass as ankeritic, arsenopyrite-bearing quartz vein material with cm-scale euhedral quartz crystals. Subcropping mineralization takes the form of a limonitic vein in a recessive pass, likely some 5 cm thick, and ran 1.62 g/t Au.

Soil sampling at Marmot Pass in 2019 identified anomalous gold, arsenic, antimony and mercury in soils near the Algae anticline and fault another 4 kilometers past the previous southeastern limit of sampling along this trend, extending the total potential length of the soil anomaly to 30 kilometers. Anomalous soils up to 58 ppb Au were encountered in a 200 m wide zone across the southern side of the Marmot Pass summit.