Recent rock geochemical sampling on a 150-metre spaced grid over most of the project (Zonia and Silver Queen claim blocks) has generated a new porphyry copper target, the Northeast Anomaly, based on coincident anomalous copper, molybdenum and manganese. The 2500 by 1000 metre anomaly occurs northeast of the drill-defined Zonia copper oxide deposit, and shares characteristics of its geochemical footprint.
Coincident areas of elevated molybdenum (Mo) and copper (Cu) values with depressed manganese (Mn) values is a classic geochemical signature of porphyry copper mineralization. Copper values are also anomalous, but copper is not as reliable as the other metals due to its solubility in the weathering profile. The overlapping anomalies suggest a porphyry copper target size on the order of 2500 by 1000 metres. The same quartz-feldspar porphyry dacite that hosts the Zonia copper oxide resource (see NR17-08) underlies the anomaly. The anomaly marks a break in the northeast trend of the mineralization, with a narrow southern "tail" that opens northward to a broader northeast trend. The anomaly is truncated at the north end by younger, post-mineral cover rocks (Gila conglomerate, alluvium, and Tertiary basalt). The east margin of the anomaly contains some narrow high-grade copper bearing structures in the historical Copper Crown mine workings, with associated intense epidote alteration.
Cardero completed a 28 line-kilometre IP survey over the Zonia project in February, 2018. This study indicates depth to sulphides (depth of oxidation) is greater than 300m under the Northeast anomaly.