Supporting code and data used for the analysis reported in 'Global coal trade is resilient to maritime chokepoints', available as preprint via https://arxiv.org/abs/2608.00328 The folder 'julia opt code' is where the code is saved, with 1) the code to identify baseline results 2) the code to loop over different regions and coal types in order to identify prices and revenues in different regions 3) the code used to derive preference parameters for trade between different country (group) pairs Note that all code and data is as orginally used with the exception of the file 'prod capa cost price brand by mine latest.xlsx'. This file contained proprietary data from Wood MacKenzie: individuals interested in replicating the reserach will need to acquire a license and replace current placeholder values with real data. The required datasets, also referenced in the paper, are: Wood Mackenzie. China coal supply data - version of Q1 2021 Wood Mackenzie. Russia coal supply data - version of Q2 2024 Wood Mackenzie. Global seaborne export metallurgical coal cost curve version of 2024 Wood Mackenzie. Global seaborne export thermal coal cost curve version of 2024