Break bulk terminal operators are constantly in search for improving the performance of their operations. The logistical processes associated with these operations are complex and identifying where improvements have the largest impact on performance therefore is as well. In this paper a combination of system thinking and discrete-event-simulation methods is used to analyse and mimic the loading procedure of deep-sea vessels in the harbour of a large steel manufacturer. A set of alternative resource and machine configurations is tested with a built simulation model to measure the potential performance increase compared to their current operations performance. Results provide insights for the decision-making process in which the manufacturer has to decide what investments have to be made in the future.