Quantity: 3-4
Miners and salvagers have essentially the same job in that they both adventure off away from the station (often times using a shuttle) to look for and retrieve usable resources for the station.
The resources could be anything from raw materials or strange plants, to abandoned hardware or strange artifacts. There will also be plenty of surprises and dangers.
The main difference between the 2 jobs is where they are going to retrieve the resources, this determines what resources are available and how to acquire them, which determines the equipment the role requires.
Mining usually entails traveling to a planet-like map and breaking away at the cosmic body to find buried raw materials.
Salvaging usually entails traveling to a station-like map and looting and deconstructing derelict structures for raw materials and components.
Some rounds will only have a location for mining, some will only have a location for salvaging, some will have both.