Touchstone Gold rose by 15% on Wednesday after its GOS Systems subsidiary won a government contract.GOS Systems will deploy technical surveillance countermeasures equipment for the client.The unnamed client, revealed only as a "government department", will be able to target intelligence gathering capability and identify threats "effectively in a timely and secure manner", the group said.Touchstone did not reveal any financial details about the deal, but said it will comprise of an initial one-off payment and the potential to generate a longer-term support and maintenance revenue stream.GOS chief executive Jamie Ridealgh said: "The cost effectiveness and flexibility of our solutions, combined with the high level of demand for high quality security products, is attracting interest from local and overseas public security organisations."GOS is well placed to benefit from the growing market in intelligence gathering and secure communications."Shares in Touchstone were up 14.74% to 0.55p on Wednesday at 13:46.