The CZ (Fly 25) occurrence is located near a small swamp or pond, approximately 1.5 kilometres northeast of Lemon Lake and 10.5 kilometres northeast of the community of Horsefly.

Copper mineralization is associated with the Triassic-Jurassic monzonitic to dioritic Lemon Lake stock, which occurs within volcanic rocks of the Nicola Group in the central Quesnel belt. The stock has intruded Upper Triassic basalt and overlying Lower Jurassic breccias containing felsic volcanic and plutonic clasts. These latter breccias are partly coeval with, and form an apron about, the felsic stock. Both the volcanic and the intrusive rocks have alkalic to sub-alkalic compositions with shoshonitic affinities.

Mapping on the Lemon Lake property in 2007 and 2010 determined that copper and gold mineralization occurs exclusively in the Mesozoic Lemon Lake stock in the western half of the property and is associated with moderate to strong potassic alteration. Outcrops of volcanic rocks are limited to the east side of the property, and include both flow and pyroclastic rocks. Flow rocks consist of pyroxene- and olivine-phyric basalt and plagioclase-phyric andesite. Pyroclastic rocks are predominantly polymictic lapilli tuff, with a pyroxene-phyric, andesitic groundmass. Volcanic breccia, pillow basalts and mafic tuff are common, as are felsic tuffaceous breccias, lithic tuffs, tuffaceous sandstone and siltstone (Assessment Report 31864).

The volcanic rocks adjacent to the stock and parts of the stock itself have undergone propylitic alteration, characterized by the development of calcite, chlorite and epidote. Zeolite alteration in places may also be of hydrothermal origin. Biotite alteration and secondary potassium feldspar is commonly associated with copper mineralization in syenodiorite and monzonite. Copper mineralization also occurs sparsely in the surrounding volcanics. Weakly anomalous gold values have been determined in propylitized volcanic rocks surrounding the stock. Mineralization consists of chalcopyrite, bornite, malachite, pyrrhotite, magnetite, pyrite and molybdenite.

In 1974, a percussion drill hole (74L-4) on the Fly 25 claim intersected a variably potassium feldspar altered biotite monzonite yielding 0.18 per cent copper over 39 metres, including 0.252 per cent copper and 0.34 gram per tonne gold over 21 metres and 0.700 per cent copper and 0.69 gram per tonne over 3 metres (Property File - Mt. Calvery Resources Ltd. [1981-01-01]: Data Compilation - Lemon Lake Cu/Au Prospect). This became the CZ zone (Target A in 2021), which is delineated as a north-northeast, 140 metre long and 25 to 50 metre wide zone located north of the main logging road. It is open to the northeast and located east of the strong potassium felspar-sericite-chlorite-pyrite alteration interpreted to coincide with a chargeability high. The target is partially defined by 0.23 per cent copper over a 24.2 metre interval in percussion drill hole 74L-4 and grab samples of subcrop and outcrop that carried up to 0.125 per cent copper and 0.22 gram per tonne gold. Two narrow sub-vertical potassium feldspar veins roughly parallel the northeast trend of Target A (Assessment Report 39604).

A 2011 IP and magnetic survey in the western region of the Lemon Lake property defined a zone of anomalous chargeability associated with elevated copper and gold that extends to the northeast over a distance of about 2.5 kilometres which largely covers the monzonitic phase of the pluton. This CZ showing area correlates with a magnetic and resistivity low that was tested by a single drill hole in 1974. This hole drilled by Hudson Bay Oil and Gas tested the periphery of the IP chargeability anomaly and intersected 0.25 per cent copper over 21 metres starting from the surface (the hole was not assayed for gold).

In 2022, drill hole LL-22-01 intersected primarily diorite cut by several monzonite dikes. From the top of bedrock at 3.05 metres to 58.00 metres the hole intersected 0.105 per cent copper and 0.076 gram per tonne gold.

In 2025, drill hole CAM25-009 (120 metres northeast of CZ prospect) returned 156.6 metres, from 23.4 to 180 metres downhole, assaying 0.06 gram per tonne gold, 0.08 per cent copper, 0.34 gram per tonne silver and trace molybdenum; including 19 metres of 0.14 gram per tonne gold, 0.18 per cent copper, 0.65 gram per tonne silver and trace molybdenum which includes 7.5 metres of 0.24 gram per tonne gold, 0.32 per cent copper, 1.09 grams per tonne silver and trace molybdenum. Mineralized intervals with chalcopyrite were associated with epidote + potassium feldspar ± albite alteration, and quartz ± carbonate veins (PR REL Prospect Ridge Resources Jan. 22, 2026). Drill hole CAM25-007 was located on Target B (Bravo), 630 metres west of the CZ prospect. Drilling intersected moderately altered andesite cut by monzonite, with pervasive disseminated pyrite and trace chalcopyrite. The uppermost 35 metres of the hole consists of magnetite-altered andesite. Assays returned a 12.0 metre interval, from 186 to 198 metres downhole, averaging 0.13 gram per tonne gold, 0.06 per cent copper and 0.42 gram per tonne silver, including 6 metres of 0.22 gram per tonne gold, 0.1 per cent copper and 0.60 gram per tonne silver (PR REL Prospect Ridge Resources Feb. 25, 2026).

WORK HISTORY

Since the 1960s, the Lemon Lake area has been explored for gold and silver potential. Historical work includes geophysical surveys, soil and rock sampling, prospecting, geological mapping, trenching and reverse circulation, percussion and diamond drilling.

In 2008, Cedar Mountain Exploration Inc. ran programs of rock, till and stream sampling and the interpretation of 2003 airborne radiometric and magnetic surveys resulting in nine targets for follow-up investigations. A geological mapping program was carried out over the Lemon Lake property in 2010. In 2011, Metalogic Exploration Inc. undertook a ground IP (induced polarization) and magnetic survey over the western part of the Lemon Lake pluton, west of the Pine prospect.

In 2018, Evrim Exploration Canada Corp. conducted a program of prospecting, soil and rock sampling, mapping and IP modelling over the Lemon Lake property. In 2021, Orogen Royalties Inc. (formerly Evrim Exploration) and property option holders conducted a program of geological mapping, rock sampling/hand trenching, airborne magnetic/VLF survey, petrology and evaluation of historical drill results and geochemical and geophysical data compiled from previous programs. This data was applied to define drill targets A (CZ prospect area), B (southwest of CZ prospect) and C (Melon-Pine area) on the Lemon Lake property.

In 2022 and 2023, two HQ diamond drill holes were completed by Orogen Royalties, one in the CZ prospect area (Target A) and one in the Melon prospect area (Target C), 1.5 kilometres south-southeast of CZ (Assessment Report 41445).

In September 2025, Prospect Ridge Resources Corp. acquired, from Orogen Royalties Inc., a 100 per cent interest in the 26.46 kilometre² Camelot Project (formerly Lemon Lake property) and commenced a diamond drill program on targets A and B, extending from the southern tip of Lemon Lake northeastward to the CZ prospect area (PR REL Prospect Ridge Resources Dec. 22, 2025). A total of 2,034 metres was drilled in ten holes (CAM25-001 to CAM25-010) from eight drill pads.

Refer to PINE prospect (Minfile 093A 002) for a more complete history of exploration on the Lemon Lake property.