The region is underlain to the west by Mesozoic sedimentary and volcanic rocks of the Quesnellia Terrane and to the east by Proterozoic to Paleozoic dominantly metasedimentary rocks of the Omineca Belt. Quartz veins in greenschist facies rocks of the Omineca Belt are commonly auriferous and erosion and subsequent reworking has undoubtedly contributed to the rich gold placers of the region. The Hannandor deposit occurs on Lightning Creek at the junction of Angus Creek in the southeastern corner of the map area. This deposit is one of several past placer gold producers on Lightning and other creeks draining the Omineca Belt. These placer deposits occur in late Tertiary (Miocene) gravels.

Data from the Cariboo mining district indicate that supergene leaching of gold dispersed within massive sulphides by Tertiary deep weathering followed by Cenozoic erosion is the most likely explanation for the occurrence of coarse gold nuggets in Quaternary sediments (Exploration in British Columbia 1989, page 147).

In 1960, work included the construction of access road and a bridge across the creek; a washing plant was erected on the site, consisting of a hopper, trammel screens, tables, and stacking conveyor, and 5,000 cubic yards of gravel was excavated by dragline and put through this plant. A further thousand cubic yards of gravel was hydraulicked. In 1961, the property and plant were subleased to Trommel Mining Ltd, which did a small amount of work.

In 1969, while under contract to the owner, Hannador Gold, Harcol Placer Production Ltd cleared an area 183 metres by 30 metres, dug some trenches dug to a depth of 5 metres by back-hoe, and drilled two holes totalling 70 metres.

In 1970, Consolidated Vigor Mines Ltd. tested the Hannador placer leases on Lightning Creek downstream from the junction of Angus Creek

In 1972, Harcol Placer Production Ltd brought in a washing and screening plant utilizing conveyors and including a jig, with a capacity of 2,000 yards per day. A 1.5-yard dragline casts into the feed hopper on the washing plant. Conveyors transported the waste fraction to spoil piles which were distributed by bulldozer. Camp facilities for some 30 men were assembled on the property. After two weeks of running-in and operation, the project was suspended in July of 1972.

In 1974, development work=, consisting of pumping out pits in gravel and washing gravel.

In July 1992, Gallery Resources Ltd. conducted a testing program in the area of Placer Mining Lease 5743. The program consisted of reverse circulation drilling, seismic surveying and bulk testing from excavated pits. The 1992 test program of the Lightning bench on the Hannador property has outlined a reserve of 790,000 cubic yards with an average indicated value of $7.48 (Cdn) per cubic yard. The reserve as outlined is overlain by lower grade material especially along its southern limits. Preliminary calculations suggest a 1.24:1 stripping ratio for reported reserves (Report by C.K. Ikona and R.J. Darney).

In 1993, 55,150 cubic yards (42,134 cubic metres) were processed from bedrock to 9.1 metres above bedrock yielding 1855.1 ounces (57,693 grams) of raw gold; 26,750 cubic yards (20,437 cubic metres) of material from 9.1 to 12.1 metres above bedrock yielded 264.1 ounces (8213 grams) gold. An additional 9900 cubic yards (7563 cubic metres) of gravel above this level was washed to determine grades and 17.7 ounces (550 grams) of gold was produced (Explore B.C. Program 94/95 - A4).

In 1995, with Explore B.C. Program support, Gallery Resources Ltd. carried out refraction seismic, topographic and geological surveys and 730 metres of auger drilling in 8 holes. The drilling intersected thick sections of glacial clays. The refraction seismic survey and sampling of existing trenches identified the Bonanza Bench as an area of stacked auriferous channels with values up to $29 per yard (Explore B.C. Program 95/96 - M134).

In 1996, Gallerry Resources completed a reverse circulation drill of 19 holes on the Jo Jo claims located just upstream from the Hannador workings on Lightening Creek. The drilling proved that the area is underlain by black shale or argillite. Half of the bedrock samples contained free gold in varying small amounts. None of the gold was attached to quartz chips or shale and it was concluded that the gold had worked its way into fractures up to a meter deep in bedrock.

Gallery Resources Ltd. announced that gold production will begin in early May 1997. Reserves were estimated at 400,000 tons (362,840 tonnes). The initial production goal is scheduled at 2500 tons (2267 tonnes) per day with recoverable gold value of a minimum of $10 per ton (T. Schroeter, personal communication, 1997)

In 1998, Gallery Resources Ltd. completed reclamation of the Hannador pit, part of its large lease holdings on Lightning Creek.