In 1917 Bendigo Amalgamated Goldfield Ltd was formed from the amalgamation of 35 companies with operations on the Garden Gully, Sheepshead, Deborah and Derby lines of reef hoping to increase profits of these existing operations through economies of scale. This was difficult to achieve as the shafts involved were spread throughout the goldfield. Diamond drilling and good geological practices were introduced (Pabst was Chief Geologist) leading to some exploration success. However costs were rising rapidly and in 1923 the directors, deciding that mining would soon become unprofitable, dissolved the company returning assets to the original vendors. J.H. Lenten, Mine Manager, received his second class Mine Manager's certificate in September, 1914 at an examination held at the Bendigo Law Courts. One hundred pages of fortnightly manager's reports for Bendigo Amalgamated Goldfields N.L., Sheepshead Shaft. Reports consist of two pages for each fortnight, signed by J.H. Lenten, Mine Manager. Dates of reports range from November 20th, 1917 to 5th May 1920. Categories reported on include: development, stoping, tons from tributors, tons Company's stone, plant and machinery, underground workings, number of rock drill shifts, firewood used, coal burnt, and general remarks. charcoal burnt., lifting waterbendigo, margaret roberts, , goldmining, bendigo amalgamated goldfields, sheepshead shaft, j.h. lenten, mine manager