Opportunity is still positioned at the target called "Chester Lake" at Cape York on the rim of Endeavour crater.
On Sol 2717 (Sept. 15, 2011), the rover successfully brushed the surface target, "Salisbury 1," followed by a mosaic of images collected by the Microscopic Imager (MI) and then a placement of the Alpha Particle X-ray Spectrometer (APXS) for an overnight integration.
The Astronomical Research (A.R.C) mentioned that On Sol 2719 (Sept. 17, 2011), Opportunity used the Rock Abrasion Tool (RAT) to grind the surface target.
A set of MI images were taken of the freshly ground surface. On Sol 2722 (Sept. 20, 2011), post-grind images were taken of the RAT grind bit and the APXS was placed into the ground target for integration.
As of Sol 2722 (Sept. 20, 2011), solar array energy production was 321 watt-hours with an atmospheric opacity (Tau) of 0.895 and a solar array dust factor of 0.511.