This dataset consists of the data generated from the physical property analysis of sediment to model the physical and temporal response of deep-sea sediment to the compression caused by a deep-sea mining vessel. The results were generated from seafloor sediment samples collected as part of the Seabed Mining And Resilience To EXperimental impact (SMARTEX) Highlight Topic project funded by the UK Natural Environment Research Council (Grant References NE/T003537/1 and NE/T002883/1) alongside other partner institutions in the project. The tests were conducted to evaluate the consolidation behaviour, compressibility, and void ratio evolution of the material under controlled laboratory conditions representative of the expected in-situ response. The dataset consists of two one-dimensional consolidation experiments conducted on frozen seafloor sediment using an automated oedometer apparatus in the Soil Testing Laboratory at the British Geological Survey, Keyworth, UK. The results are provided in Microsoft Excel csv spreadsheets and have an accompanying data report detailing the methodology and csv outputs. Additional related datasets associated with this project are [1] porewaters extracted for trace metals, nutrients and alkalinity and sediments analysed for trace element geochemistry, loss on drying, particle size analysis and bulk and clay mineralogy by XRD and [2] laser ablation ICP-MS line transects performed across selected entire manganese nodules for high resolution, in-situ geochemical analysis. The samples were collected as part of Expedition JC241 2023 in the Ocean Minerals Company (OMCO) test mining site in the Clarion-Clipperton Zone of the Central Pacific Ocean. More information, location and the cruise report are available at www.bodc.ac.uk/resources/inventories/cruise_inventory/report/18136/
